Class 9

Balbharti Maharashtra State Board Class 9 English Solutions My English Coursebook Chapter 1.3 ‘Hope’ is the Thing with Feathers Notes, Textbook Exercise Important Questions and Answers.

Maharashtra State Board Class 9 My English Coursebook Solutions Chapter 1.3 ‘Hope’ is the Thing with Feathers

My English Coursebook Std 9 Digest Chapter 1.3 ‘Hope’ is the Thing with Feathers Textbook Questions and Answers

Warming up!

Chit-chat:

• Do you ever feel nervous?
• Do you ever feel really depressed?
• What makes you nervous or depressed?
• What do you hope for on these occasions?
• Have you hoped for something that you knew was difficult?
• What do you have to do to fulfil ‘your opes?

The Only Ray of Hope

1. Divide the class into groups of 4-6. Each group selects for itself, one of the difficult situations listed below. They imagine themselves to be in that situation and carry on with the rest of the activity.
(a) A group of passengers are marooned on an island in the middle of the ocean
(b) A group of pilgrims travelling on foot have lost their way in a thick jungle.
(c) A team of players from an office have got down at the wrong place on a highway at night. It is a lonely spot.
Answer:
Situation: (a)
(a) A group of passengers are marooned on an island in the middle of the ocean

Question 1.
Describe your surroundings in 4-5 sentences:
Answer:
We are trapped on a small island in the middle of the ocean. It is a desolate, uninhabited island. We are all alone on this island. There are thick forests around us and frightening pythons and other poisonous snakes are slithering around us. Nothing can be seen except the thick forests, marshy land and vast waters of the ocean.

Question 2.
Write the reactions of your companions using exclamations :
Answer:

1. “What a horrifying experience!”
2. “Look, oh God! Our ship has left the shore without us on this desolate island!”
3. “What shall we do now?”
4. “How can we escape from this dangerous situation!”
5. “Nothing on earth would save us !”

Question 3.
Using your imagination, write what is the only ray of hope for you.
Answer:
Let us hope that the people on our ship find us missing and return back to this island or some other ship, helicopter or a plane notices our movements and save us from this horrible situation that would be our only ray of hope.

Question 4.
Two members of your group are going out to try to get help. They can take any five things with them. Write what they choose, and why they choose it.
Answer:
They will take a piece of white cloth to show their presence on the island to ships, helicopters, planes, etc. They will take mobile phones for contact, food packs, a water bottle, a matchbox and a stick for protection.

English Workshop:

1. Match the following 

Question 1.
Match the following

‘A’	‘B’
1. Hope	(a) difficulties and problems
2. Gale/storm	(b) toughest times in life
3. keep warm	(c) a very small bit
4. chillest land	(d) a nest in the tree
5. a crumb	(e)   provide comfort
	(f)   Bird

Answer:

‘A’	‘B’
1. Hope	(f)   Bird
2. Gale/storm	(b) toughest times in life
3. keep warm	(e)   provide comfort
4. chillest land	(a) difficulties and problems
5. a crumb	(c) a very small bit

2. Use the proper form of the verb in each line:

‘Hope’ is the thing with feathers –

Question a.
That (perch) in the soul
Answer:
That perches in the soul

Question b.
And (sing) the tune without the words
Answer:
And sings the tune without the words

Question c.
And never (stop) at all
Answer:
And never stops at all

3. Read the examples and fill in the blanks in the same pattern.

Question 1.
Read the examples and fill in the blanks in the same pattern.
Answer:
(a) Examples of degrees: sweet – sweeter – sweetest

1. fast – faster – fastest
2. slow – slower – slowest
3. high – higher – highest
4. low – lower – lowest
5. great – greater – greatest
6. bright – brighter – brightest
7. warm – warmer – warmest
8. cold – colder – coldest

(b) Examples: strange – stranger – strangest

1. brave – braver – bravest
2. fine – finer – finest
3. simple – simpler – simplest
4. large – larger – largest
5. close – closer – closest
6. wise – wiser – wisest

(c) Examples: pretty – prettier – prettiest
(Note the changes in the last letter.)

1. nasty – nastier – nastiest
2. hungry – hungrier – hungriest
3. angry – angrier – angriest
4. naughty – naughtier – naughtiest

4. Find the phrases/lines in the poem that mean the following :

Question 1.
(a) Hope is a light, delicate thing: …………………………
(b) Hope offers comfort to your soul: …………………….
(c) Hope is not a wordy thought, it is more like a feeling, an emotion: ………………….
(d) In the most difficult times, hope offers the greatest comfort: …………………………
(e) Hope is not easily defeated: …………………..
(f) Hope has given comfort to many people: ………………….
(g) Hope lives on in very hard times, even when it gets nothing from you: ……………….
Answer:
(a) Hope is a light, delicate: Hope is the thing with thing feathers.
(b) Hope offers comfort to that perches in the your soul soul and sings.
(c) Hope is not wordy: And sings the tune thought, it is more like a without words. feeling, an emotion
(d) In the most difficult: Second stanza – And times, hope offers the sweetest… so many greatest comfort warm
(e) Hope is not easily defeated: And never stops at all
(f) Hope has given comfort: That kept so many to many people warm
(g) Hope lives on in very hard: Yet – never – in times, even when it gets extremity, It asked a nothing from you. crumb – of me.

5. We can relate many of our feelings and experiences to events or things in nature. Which of our feelings or experiences can we relate to the following?

Question 1.
We can relate many of our feelings and experiences to events or things in nature. Which of our feelings or experiences can we relate to the following?
Answer:

1. darkness: evil sign
2. a storm: difficulties
3. sunrise: beginning, progress, growth
4. a light shower: pleasure
5. sunshine: happiness
6. earthquake: a sudden violent damage
7. a rainbow: unexpected joy
8. dawn: the beginning of something
9. dark clouds: sad or difficult situation
10. dusk (evening): almost the end of something
11. a peacock: pleasant feeling
12. flood: a lot of difficulties, damages

6. Write in a few lines, about an experience of your own where you scored in your exams much more than you hoped for. What did that experience teach you?

Question 1.
Write in a few lines, about an experience of your own where you scored in your exams much more than you hoped for. What did that experience teach you?
Answer:
I could get much more marks in exams than I hoped for and I was on the cloud nine. Really very happy! Everyone admired me for my effort. It was a great experience. It taught me that if you hope for something heartily and work accordingly, you can achieve anything according to your hope and expectation. Hoping is achieving!

Language study:

7. This poem is an example of personification. When we refer to inanimate objects, ideas, emotions as living things, it is an example of personification. Here, ‘hope’ is portrayed as a little bird. Describe it in your own words. Find other examples of personification.

Question 1.
Describe it in your own words.
Answer:
‘Hope’ in this poem is described as a bird sitting in our soul. Here ‘Hope’ is a non-living thing, but it is described as a living thing, bird. Hope is represented here as a living thing. So it is the example of personification.

Question 2.
Find other examples of personification.
Answer:
Some examples of personification

1. The grass was dancing with the wind. Here dancing is the quality/action of a person. Grass is personified as a person.
2. Trees were shivering with fear when they saw the woodcutter. Trees are given the human quality of ‘shivering with fear’
3. The moon was laughing in the sky. Here the moon is given the human quality of laughing.

My English Coursebook 9th Class Solutions Chapter 1.3 ‘Hope’ is the Thing with Feathers Additional Important Questions and Answers

Simple Factual Activity:

Question 1.
Complete the following lines from the poem :
(Answers are directly given.)
Answer:

1. The hope-bird is sitting in the soul.
2. Singing of the bird never stops.
3. Its song is the sweetest at the time of storm.
4. The poetess has heard the bird’s song in most difficult circumstances.

Appreciation of Poem:

1. Title: ‘Hope is the thing with feathers -’
2. Poet: The poetess of the poem is Emily Dickinson.
3. Theme/Central Idea: The central idea of the poem is the role played by hope in our lives. According to the poetess, hope – the little bird that nests in our soul – keeps us going even in the most difficult of times and demands nothing in return.
4. Rhyme Scheme: The rhyme scheme of the first 2 stanzas is ‘abab’ whereas in the 3rd stanza it is ‘abbb’.
5. Figure of Speech: ‘Personification’.
6. Special Features: This poem is full of implied meanings. It tells you the importance of hope and helps you to survive in any difficult days or occasions.
7. Favourite Lines: My favourite lines from the poem are :

• “And Sweetest – in the Gale – is heard
• Yet – never – in Extremity, It asked a crumb – of me.

8. Why I like the poem: I like the poem for its positive message. According to the poet, hope is not easily defeated. It sustains us. Hope also encourages us to move forward. This message, I think, is very important for a young person.

Balbharti Maharashtra State Board Class 9 History Solutions Chapter 1 Sources of History Notes, Textbook Exercise Important Questions and Answers.

Maharashtra State Board Class 9 History Solutions Chapter 1 Sources of History

Class 9 History Chapter 1 Sources of History Textbook Questions and Answers

1. A Choose the right option and rewrite the sentence.

Class 9 History Chapter 1 Sources Of History Questions And Answers  Question 1.
The National Archives of India is situated at ______.
(a) Pune
(b) New Delhi
(c) Kolkata
(d) Hyderabad
Answer:
(b) New Delhi

Sources of History Class 9 History Chapter 1 Question 2.
The _______ is included among the Audio -Visual media.
(a) Newspaper
(b) Television
(c) All India Radio
(d) Periodicals
Answer:
(b) Television

Question 3.
______ is not included in physical sources.
(a) Coins
(b) Ornaments
(c) Buildings
(d) Proverbs
Answer:
(d) Proverbs

B. Identify the wrong pair and rewrite the corrected one:

Question 1.
(1) Jal Cooper – Philatelist
(2) Kusumagraj – Poet
(3) Anna Bhau Sathe – People’s bard
(4) Amar Shaikh – Art Collector
Answer:
Amar Shaikh – Art Collector

2. Write Short Notes:

Question 1.
Written Sources
Answer:
(i) Any historical document written by hand or typed or in printed form is called written sources.
(ii) The following are included in written sources: Newspapers, Periodicals, Diaries, Reference books, Correspondence, Document in the Archives, Government Gazettes, Postage Stamps, and Encyclopedias.

Question 2.
Press Trust of India (PTI)
Answer:
(i) After 1953, the Press Trust of India has been an important source of primary details of all important events and of articles on important subjects.

(ii) Press Trust of India has provided reports, photographs and articles on financial and scientific issues to newspapers. PTI has now started its online service.

(iii) During the 1990s, PTI started using the ‘satellite broadcast’ technology instead of teleprinters to send news all over the country.

(iv) This material is important for writing the history of modern India.

3. Give reasons:

Question 1.
The postal department tries to preserve the heritage and integrity of Indian culture through postage stamps.
Answer:
(i) Postage stamps reveal a lot to us about changing times due to the variety in the sizes of the stamps, the novelty in their subjects and colour schemes.

(ii) The Postal Department issues postage stamps on a wide variety of themes.

(iii) It issues stamps on political leaders, flowers, animals, birds, an event, or the silver, golden, diamond jubilees or centenary, bicentenary and tercentenary of different events.

(iv) It is therefore, a valuable repository of history.

(v) Thus the postal department tries to preserve the heritage and integrity of Indian culture through postage stamps.

Question 2.
Audio-visual media are an important source for writing the history of modem India.
Answer:
(i) Audio-visual means possessing sound and visual content; for example, films and television

(ii) We have channels like History channel and Discovery channel which telecast footage of historical events in multimedia.

(iii) With the help of satellites, live coverage of all political, social and cultural events is possible across the globe. This helps to create an accountable repository for future reference as well.

(iv) Video libraries possess a vast storage of historical information in audio-visual mode which becomes handy in writing the history of modem India.

Class 9 History Chapter 1 Sources of History Additional Important Questions and Answers

Choose the correct option from the given options and rewrite the statements:

Question 1.
Information and Broadcasting Department published ______, an annual reference book.
(a) India 2000
(b) Incredible India
(c) Indian Horizon
(d) Aspiring India
Answer:
(a) India 2000

Question 2.
The place where historical documents are _______.
preserved is called
(a) Library
(b) Store Room
(c) Archives
(d) History Room
Answer:
(c) Archives

Question 3.
Newspapers are considered the _______ pillar of democracy.
(a) First
(b) Second
(c) Third
(d) Fourth
Answer:
(d) Fourth

Question 4.
_____ has also produced various documentaries on prominent social leaders, on people who have made major contributions and about important locations in India.
(a) British Broadcasting Corporation (BBC)
(b) Reuters
(c) Indian News Review
(d) Bloomberg
Answer:
(c) Indian News Review

Question 5.
Aavahan is written on the backdrop of Sino- Indian war by the noted Marathi poet _____.
(a) Narayan Gupte
(b) Kusumagraj
(c) G.D. Madgulkar
(d) Namdeo Dhasal
Answer:
(b) Kusumagraj

Question 6.
Cooper edited _______.
(a) India’s Stamp Journal
(b) Indian Philatelic Magazine
(c) Stamp Synopsis
(d) The Journal of Philatelic Bureau
Answer:
(a) India’s Stamp Journal

Question 7.
After 1953, the ____ has been an important source of primary details of all important events.
(a) Union Trust of India
(b) Press Trust of India
(c) Information and Broadcasting Ministry
(d) Film and Television Institute of India
Answer:
(b) Press Trust of India

Question 8.
Duringthe 1990s, PTI started using ____ technology instead of Teleprinters.
(a) GPS Device
(b) Ultrasonic Gadget
(c) Radio Programming
(d) Satellite Broadcast
Answer:
(d) Satellite Broadcast

Question 9.
The Government of India started the Film and Television Institute of India at Pune in 1960 with the purpose of providing _______.
(a) Entertainment
(b) Public Education
(c) International updates
(d) Intra-societal information
Answer:
(b) Public Education

Question 10.
The Indian government issued the ______ stamp in 1977.
(a) Narsee Monjee
(b) Jal Cooper
(c) Birsa Munda
(d) Senapati Bapat
Answer:
(b) Jal Cooper

Question 11.
The Chhatrapati Shivaji Maharaj Museum is at ________.
(a) Delhi
(b) Mumbai
(c) Kolkata
(d) Chennai
Answer:
(b) Mumbai

Question 12.
The ______ issues postage stamps on a wide variety of themes.
(a) Publications Division
(b) Postal Department
(c) Income Tax Department
(d) Revenue Department
Answer:
(b) Postal Department

Question 13.
______ prints the notes.
(a) Reserve Bank of India
(b) Union Bank of India
(c) Philatelic Bureau of India
(d) State Bank of India
Answer:
(a) Reserve Bank of India

Question 14.
Empire of India Philatelic Society was founded by ______.
(a) Pherozeshah Mehta
(b) Mahzarin Banaji
(c) Jal Cooper
(d) Dinshaw Patel
Answer:
(c) Jal Cooper

Question 15.
PTI has provided reports, photographs and articles on ___ issues to newspapers.
(a) Therapeutic
(b) Financial and scientific
(c) Demographic and Topographic
(d) Environmental
Answer:
(b) Financial and scientific

Identify and write the wrong pair in the following sets:

Question 1.
(1) Powada – Oral sources
(2) Documentaries – Audio Visual Sources
(3) Coins – Material Sources
(4) Owis – Archaeological Sources
Answer:
Owis – Archaeological Sources

Question 2.
(1) India 2000 – Annual Reference book
(2) Indian News Review – News reels and documentariess.
(3) FTII – Radio Programmes
(4) Reserve Bank of India – Printing notes
Answer:
FTII – Radio Programmes

Question 3.
(1) Chhatrapati Shivaji Maharaj Museum – Mumbai
(2) Reserve Bank Museum – Pune
(3) National Archives of India – Calcutta
(4) Film and Television Institute of India – Pune
Answer:
National Archives of India – Calcutta

Do as directed.
Complete the concept map:

Question 1.
Answer:

Question 2.
Answer:

Question 3.
Answer:

Question 4.
Answer:

Write short notes:

Question 1.
Coins
Answer:
(i) We can also understand history with the help of coins and the changes in the printing of currency notes.
(ii) The Reserve Bank of India prints the notes. It has its headquarters in Mumbai.
(iii) The coins from 1950 to those used at present, the metals used for making them, their different shapes, and the diversity of subjects on them together help us to understand the important contemporary issues in India; For example coins to convey the message of population control and coins communicating the importance of agriculture and of farmers.

Question 2.
Jal Cooper
Ans
(i) The Indian government issued the ‘Jal Cooper’ stamp in 1977. Jal Cooper was an internationally acclaimed philatelist, i.e. an expert on the subject of ‘postage stamps’.
(ii) Bom in a Parsi household in Mumbai, Cooper edited ‘India’s Stamp Journal’.
(iii) He was the founder of the first Philatelic Bureau in India, an office that collected stamps. He founded the ‘Empire of India Philatelic Society.
(iv) He went on to write many books on this subject. He gave a scientific bent to his hobby.
(v) He played a pivotal role in taking the study of Indian postage stamps to the international level.
(vi) Having started his career as a postage stamp collector, Cooper achieved the expertise of a philatelist at the international level.
(vii) The postage stamp on Jal Cooper is an important source to understand his significant contribution to this field.

Explain the statements with reason:

Question 1.
Museums reflect the unique heritage of a state.
Answer:
(i) All states of India have museums that depict the characteristics and display the cultural and social heritage of the state.
(ii) They enable us to understand history; For example, the Chhatrapati Shivaji Maharaj Museum at Mumbai and the Reserve Bank Museum in Pune city.
(iii) Apart from the Government Museums, some private collectors also set up their own museums.
(iv) They are based on distinctive subjects; For example, coins, notes, lamps and nutcrackers in different shapes, cricket equipment, etc.

Read the passage and answer the questions.

The Indian government issued the ‘Jal Cooper’ stamp in 1977. Jal Cooper was an internationally acclaimed philatelist, i.e. an expert on the subject of ‘postage , stamps’. Bom in a Parsi household in Mumbai, Cooper edited ‘India’s Stamp Journal’. He was the founder of the first Philatelic Bureau in India, an , office that collected stamps. He founded the ‘Empire of India Philatelic Society’. He went on to write many , books on this subject. He gave a scientific bend to his , hobby. He played a pivotal role in taking the study of Indian postage stamps to the international level, , Having started his career as a postage stamp collector, Cooper achieved the expertise of a philatelist at the international level. The postage stamp on Jal Cooper , is an important source to understand his significant ,contribution to this field.

Question 1.
Other than Philatelies which other streams of vocation deal with sources of history?
Answer:
Other than Philatelies, other streams of vocation which deal with sources of history are: Numismatics, Museology and Archaeology.

Question 2.
Name the two institution founded by Jal Cooper.
Answer:
Two institutions founded by Jal Cooper are:

(i) The First Philatelic Bureau in India.
(ii) Empire of India Philatelic Society.

Question 3.
Why do you think the government of India issued a postage stamp in the name of Jal Cooper?
Answer:
Jal Cooper is accredited to raise Indian Philatelies to an international level. He nurtured his hobby with great expertise and became a renowned Postage Stamp Collector. To honour his contribution, the government of India issued a postage stamp in his name in 1977.

Answer the following questions in detail.

Question 1.
Which information among print media is considered authentic and trustworthy?
Answer:
Among the print media, the information contained in the annual issues of the Publications Division of the Government of India is authentic and trustworthy.
(ii) For example, the Information and Broadcasting Department published ‘INDIA 2000’, an annual reference book.
(iii) ‘ This reference book is created under ‘Research, Reference and Training Department’.

Question 2.
Which sources are included in material sources?
Answer:
The following sources are included in material sources:

• Coins
• Places of worship
• Things in daily use
• Royal seals
• Ornaments
• Museums
• Clothing
• Modern architecture.

Question 3.
Write in brief about museums in India.
Answer:
(i) All states of India have museums that depict the characteristics and display the cultural and social heritage of the state.
(ii) They enable us to understand history (e.g., the Chhatrapati Shivaji Maharaj Museum at Mumbai, Reserve Bank Museum in Pune city).
(iii) Apart from the Government Museums, some private collectors also set up their own museums.
(iv) They are based on distinctive subjects; For example, coins, notes, lamps and nutcrackers in different shapes, cricket equipment, etc.

Question 4.
Write briefly about ‘Indian News Review’.
Answer:
(i) An institute called Indian News Review has produced various newsreels on important events in politics, social issues, art, sports and culture.
(ii) This department has also produced various documentaries on prominent social leaders, on people who have made major contributions for the country and about important locations in India.
(iii) These news releases and documentaries are useful for studying the history of modern India.

Question 5.
Oral Sources
Answer:
(i) These sources include folktales, folksongs, proverbs, ballads and owis (Marathi verses in the oral tradition).
(ii) Activists were inspired by the powadas of Lok shahir, Anna Bhau Sathe and Shahir Amar Sheikh during the Sanyukta Maharashtra Movement.

Question 6.
Identify the picture and give relevant information.

Answer:

• The person depicted in the picture is Jal Cooper, an internationally acclaimed philatelist from India.
• Cooper edited ‘India’s stamp Journal’. He was the founder of the First Philatelic Bureau in India, an office that collected stamps. He founded the ‘Empire of India Philatelic Society’.
• The Government of India issued the Jal Cooper Stamp in 1977.

Balbharti Maharashtra State Board Class 9 English Solutions My English Coursebook Chapter 3.5 Great Scientists Notes, Textbook Exercise Important Questions and Answers.

Maharashtra State Board Class 9 My English Coursebook Solutions Chapter 3.5 Great Scientists

My English Coursebook Std 9 Guide Chapter 3.5 Great Scientists Textbook Questions and Answers

Warming up:
Chit-chat

1. What would you like to learn about in your Science period?
2. Have you ever tried to do an experiment on your own?
   If yes, tell me about it.
   If no, tell me why you’ve never tried.
3. What would you like to learn about in your English classes?

Inventions

Question (a)
Think of as many examples of the following as you can and write them in the appropriate column:

Answer:

Type of machine	Examples
Simple machines that are operated by hand	Screwdriver, pincers, auger chisel, drill machine, spanner, etc.
Machines that run on electricity	electric motor, fan, air conditioner, hair drier, geyser, mixer, oven, etc.
Electronic devices	Mobile phones, tablets, laptops, computer, speakers, etc.

Question (b)
Write as many uses of the following as you can:
(a) A cloth bag
(b) a wicker basket
(c) a glass bottle or jar
(d) a steel bowl
(e) a thick string or rope
Answer:
(a) a cloth bag: to carry things, for keeping clothes, shopping, using instead of paper bags, etc.
(b) a wicker basket: for keeping fruits, grains, carrying and selling vegetables, fruits, fish, etc.
(c) a glass bottle or jar: for keeping jam, liquids, juice, pickles, water for drinking, for medicine, kerosene, storing liquids, etc.
(d) a steel bowl: to keep eatables while eating, for drinking medicine, while serving curry, dal, shrikhand, aamras, etc.
(e) a thick string or rope: to tie things, to play, to hold things together, used in adventure sports like trekking, mountaineering, etc., to tether cattle.

English Workshop:

1. Write what is implied in the following sentence:

Question (a)
But few know his inspirational life story, which is all about courage and fighting against the odds. (What does it tell you about Faraday’s life?)
Answer:
Faraday was born in a poverty-stricken family, suffered from a speech defect as a child, had to start working at the age of thirteen. Poor Faraday had to struggle hard against all odds because he had no social status, no money and no education. Even then he toiled hard and achieved a great success after all his difficulties.

Question (b)
Even then Davy did not have much hope for Faraday: (Choose the correct question tag.)

1. didn’t he?
2. have he?
3. does he?
4. did he?

Answer:
Even then Davy did not have much hope for Faraday, did he?

Question (c)
People started telling Davy that of all his discoveries, the best was Faraday himself. (What does it suggest about Davy’s work?)

2. Break the passage into convenient smaller sections. Give sub-headings or titles to each section:

Question 1.
Break the passage into convenient smaller sections. Give sub-headings or titles to each section:
Answer:
1. Passage: Michael Faraday is regarded as ………….. produce the first consistent light bulb.
Title: Faraday’s childhood and his work as a bookbinder.

2. Passage: That day in 1812 Faraday ………………. to see some Davy’s leading experiments.
Title: Faraday’s association with Davy.

3. Passage: Even then Davy did not have much ……………….. born out of mockery directed at Faraday.
Title: Faraday discovered the ‘induction motor’

4. Passage: Faraday became a celebrity scientist ………………. inspire him during difficult times.
Title: Davy’s jealousy and Faraday’s failure!

5. Passage: In 1829, Davy died and Faraday concept called polarization.
Title: 1. Faraday becomes head of Davy’s laboratory.
2. Finds concept of polarization.

6. Passage: He then took the age-old experiment ………………. ‘It does not matter who you are’.
Title:
1. Fortune favours Faraday!
2. Association with Maxwell and Maxwell’s equations creates revolution!

3. List the different gadgets and instruments mentioned in the passage. Find more information about at least 3 of them, using the internet:

Question 1.
List the different gadgets and instruments mentioned in the passage. Find more information about at least 3 of them, using the internet:
Answer:
Gadgets and instruments from the lesson:
fans, air conditioning, sewing machines, photographs, power tools, cars, telescopes, microscopes, electrical generators, dynamos, Electronics and communication system, etc.

4. Find out more about the following scientists with the help of the Internet.

Question 1.
Find out more about the following scientists with the help of the Internet.

1. Michael Faraday
2. Humphry Davy
3. Thomas Edison
4. James Maxwell:

(Students do this on their own using the Internet.)

Language Study:

5. Find the following matter in the passage and copy the missing words:

Question 1.
Find the following matter in the passage and copy the missing words:
(Answers are directly underlined.)
(a) When he was twelve, …………………………… school ………………….
(b) One day he came across a book on ………………………….. .
(c) Faraday decided that ………………… scientist
(d) Davy never believed ……………………. science …………………….
(e) People started telling Davy that ……………………. discoveries, ……………………….
(f) He handed him a piece of Bavarian glass, which ……………………. microscopes, ………………….
(g) He went on to prove that …………………… filings;
(h) It was Maxwell who …………………… equations ………………….
Answer:
(a) When he was twelve, his mother was forced to take him out of school.
(b) One day he came across a book on electricity which had been sent to his master for binding.
(c) Faraday decided that day that he wanted to be a great scientist.
(d) Davy never believed Faraday could do anything in the field of science.
(e) People started telling Davy that of all his discoveries, the best was Faraday himself, this made him even more jealous.
(f) He handed him a piece of Bavarian glass, which was used in the lenses in telescopes and microscopes, and asked him to reverse engineer it.
(g) He went on to prove that these patterns were not a property of the iron filings.
(h) It was Maxwell who translated Faraday’s idea into a set of equations that are now called Maxwell’s equations.

6. Now Complete the following sentences using your own words/phrases:

Question 1.
Now Complete the following sentences using your own words/phrases:
(Answers are directly given.)
(a) When he was twelve, ………………………. .
(b) One day he came across a book on ………………… .
(c) He decided that …………………. .
(d) He never believed ……………… .
(e) People started telling that ………………. .
(f) He handed him which ……………………. .
(g) He went on to prove that ………………… .
(h) It was ……………….. who ………………… .
Answer:
(a) When he was twelve, he took lessons in martial arts.
(b) One day he came across a book on ‘How to make friends’.

My English Coursebook 9th Class Solutions Chapter 3.5 Great Scientists Additional Important Questions and Answers

Simple Factual Activities:

Question 1.
State if the following statements are True or False : (Answers are directly given.)
Answer:

1. Faraday’s work on electricity is still a subject of study. – True
2. Faraday as a child, had a speech defect. – True
3. Faraday disliked reading. – False
4. The first consistent light bulb was produced by Davy. – False

Question 2.
What is the passage about?
Answer:
The passage is about the great scientists and their qualities.

Question 3.
Complete the following statements by giving reasons: (Answers are directly given.)
Answer:

1. Faraday forgot to applaud with the rest of the crowd because he was fully engrossed in Davy’s lecture.
2. Faraday didn’t just want to sell books because he wanted to be a great scientist.
3. Davy decided to hire Faraday as his secretary because a chemical explosion had temporarily blinded Davy.
4. Davy promoted Faraday to his lab assistant because Faraday worked day and night and learnt a lot about Davy’s experiments.

Question 4.
What was the subject of Davy’s lecture?
Answer:
Davy’s lecture was about the mysterious force of electric fluid.

Question 5.
Complete the sentences using the information given in the passage:
(Answers are directly given.)
1. The induction motor spurred a revolution.
2. Davy and William Wollaston were trying to re-create a famous electromagnetism experiment.

Complex Factual Activity:

Question 1.
What were the odds against Faraday in his childhood?
Answer:
Faraday faced many odds as a child. He was born in a very poor family and lived in a dirty London Suburb. He suffered from a speech defect, so much that other children laughed on his pronounces. At the age of twelve he was forced to leave his school and it was the end of his formal education. At the age of thirteen he had to take up working as a bookbinder for living.

Question 2.
What actions and thoughts of Faraday show that he was inspired by Davy?
Answer:
Faraday took notes of Davy’s lecture on ‘mysterious force of electric fluid’s comprehensively. He bound them into a book for giving a gift to Davy someday. From that day he thought of becoming a great scientist and to write his own books. Davy became his role model. He wanted Davy to become his mentor. Though, Davy did not agree, Faraday was not unhappy and disappointed and just kept trying to get his favour.

Question 3.
Was Davy fair in his treatment of Faraday? How did Faraday respond to that treatment?
Answer:
Davy definitely was not fair in his treatment of Faraday. But Faraday was not deterred and was relentless. He continued working hard day and night to learn as much as he could about Davy’s experiments. Though his work was cleaning the labs, Faraday considered himself lucky to get to see some of Davy’s experiments.

Question 4.
What happens when an electric current is applied to a wire?
Answer:
When an electric current is applied to a wire, it causes that wire to behave like a magnet and the forces are connected.

Question 5.
An induction motor is a commonly used electrical machine. What examples of its use are given here?
Answer:
The induction motor is used in fans, air conditioning, sewing machines, photographs, power tools, cars and even trains and aeroplane engines.

Give one example each to show that –

Question (a)
Faraday was a good pupil.
Answer:
Faraday respected Davy though he was jealous of Faraday. Davy gave him an impossible task to reverse engineer the Bavarian glass but Faraday accepted the assignment despite knowing that it would be very difficult. This shows that Faraday was a good pupil.

Question (b)
Davy was not a good mentor.
Answer:
Davy was jealous of his pupil’s achievement and never helped him in his difficulties. He gave Faraday an impossible task to keep him out of his way. He knew that with the equipment available in the lab, Faraday would never be able to accomplish the task. He wanted to enjoy his pupil’s failure. This shows that Davy was not a good mentor.

Question 1.
Why did Faraday keep a souvenir of his failure as a source of inspiration?
Answer:
Faraday kept a single glass brick on his shelf as a souvenir to remind himself of those difficult days. He wanted to remember his failure and the hard work he had done during those difficult days. He believed that it would inspire him in such difficult days.

Activities based on vocabulary:

What is the meaning of the following sentences:

Question (a)
Reading became his obsession.
Answer:
Faraday’s mind was completely filled with thoughts of reading and he did not think of anything else other than reading.

Question (b)
Electricity became his lifelong fascination.
Answer:
Electricity became Faraday’s very strong attraction lasting all through his life.

Question 1.
Write two compound words from the passage :
Example: bookbinder.
Answer:
1. poverty-stricken
2. lifelong

Question 2.
Match the words in Column ‘A’ with the meaning in Column ‘B’:
Answer:

‘A’	‘B’
1. pursue	(a) a person that you admire and try to follow him/her
2. role model	(b) to continue to do or achieve something
3. mentor	(c) to cheer with claps
4. applaud	(d) an expert who advises and helps less experienced persons

Answer:

‘A’	‘B’
1.  pursue	(b) to continue to do or achieve something
2. role model	(a) a person that you admire and try to follow him/her
3. mentor	(d) an expert who advises and helps less experienced persons
4. applaud	(c) to cheer with claps

Question 3.
Write four words from the passage that tell us the state of mind of a person :
Answer:

1. spellbound
2. engrossed
3. dejected
4. relentless.

Question 4.
Write words using each letter of the following words:

1. about
2. angry
3. thing
4. from.

Answer:

1. ant, ball, odd, use, table.
2. and, not, give, ray, yes.
3. that, high, inn, note, goat.
4. frog, road, ox, mango.

Question 5.
Choose the correct words from the passage and complete the table:
Answer:

Describing words	The nouns described
1. circular	patterns
2. invisible	magnetic fields
3. formal	education
4. age-old	experiment
5. impossible	tasks
6. empty	space

Question 6.
Find and write the past tense verbs with ‘-ed’ from the passage :
Answer:
filled, disturbed, copied, accepted, favoured, translated, combined, helped, designed, started.

Activities based on contextual grammar:

Question 1.
Write any four words that begin with ‘re-’ as a prefix ;
Answer:

1. rewrite
2. replace
3. replay
4. redirect.

Question 2.
He dismissed Faraday’s aspirations.
(Begin with Faraday’s aspiration-and make the sentence of Passive voice.)
Answer:
Faraday’s aspirations were dismissed by him.

Question 3.
He forgot to applaud with the rest of the crowd.
(Make the sentence negative without changing the meaning.)
Answer:
He did not remember to applaud with the rest of the crowd.

Question 4.
Find and write from the passage the adjectives used for the following nouns :

1. force
2. notes
3. explosion
4. memory.

Answer:

1. mysterious force
2. comprehensive notes
3. chemical explosion
4. excellent memory.

Question 5.
He needed an assistant.
(Frame a Wh-question to get the underlined part of the sentence as an answer.)
Answer:
What did he need?

Question 6.
Use the following phrases in the sentences of your own

1. figure out
2. born out of
3. try one’s hand at
4. to spur a revolution

Answer:

1. He couldn’t figure out the reason behind his friend’s behaviour with him.
2. Every invention is bom out of inquisitiveness.
3. Father asked me to try my hand at preparing the food item.
4. Computers have spurred a revolution in this modern world.

Question 7.
It would be very difficult
(Make it a negative sentence.)
Answer:
It would not be very easy.

Question 8.
He accepted the assignment. (Change the voice.)
Answer:
The assignment was accepted by him.

Frame wh-question to get the underlined part as answers:

Question (a)
He used the same glass now.
Answer:
What did he use now?

Question (b)
They found the strange object under a bench in the garden.
Answer:
Where did they find the strange object?

Question 1.
He was unable to explain them.
(Make it a negative sentence without changing meaning,)
Answer:
He could not explain them.

Question 2.
He made hundreds of such drawings.
(Choose the correct sentence of passive voice.)
(a) Hundreds of such drawings are made by him.
(b) Hundreds of such drawings will be made by him.
(c) Hundreds of such drawings were made by him.
(d) Hundreds of such drawings have made by him.
Answer:
(c) Hundreds of such drawings were made by him.

Do as directed:

Question 1.
Complete the words by using correct letters:

1. p _ ove
2. fi_ld
3. e _ pty
4. mi_ht

Answer:

1. prove
2. field
3. empty
4. might

Question 2.
Copy the following sentences correctly in your notebook:
Answer:
1. He couldn’t even say his own name and would call himself ‘Faraday’.
2. faraday was spellbound by Davy’s lecture in 1812.

Question 3.
Put the following words in alphabetical order:
1. epitomise, generate, convert, accomplish
2. destiny, determine, disturb, dismiss
Answer:
1. accomplish, convert, epitomise, generate.
2. destiny, determine, dismiss, disturb.

Question 4.
Punctuate the following sentences:
1. he worked day and night and learnt as much as he could about davys experiments
2. Faraday had a never give up attitude and he respected davy
Answer:
1. He worked day and night and learnt as much as he could about Davy’s experiments.
2. Faraday had a never-give-up attitude and he respected Davy.

Question 5.
Write four small words (minimum letters each) using the letters in the given word: ‘comprehensive’:
Answer:

1. come
2. cohesive
3. hen
4. hive.

Spot the error and circle it. Then rewrite the corrected sentence:

Question 1.

Answer:
Our teacher was absent yesterday.

Question 2.

Answer:
She has forgotten her notebook in school.

Write related words as shown in the example: (Answers are directly given.)

Question 1.
Write related words as shown in the example: (Answers are directly given.)
Answer:

Complete the following word-chain with any four words. Add four words, each beginning with the last letter of the previous word:

Question (a)
Complete the following word-chain with any four words. Add four words, each beginning with the last letter of the previous word:
poverty → ………. → ………. → ………… → ………….
Answer:
poverty → yank → knowing → gorgeous → slap.

Question 2.
Make a meaningful sentence by using the following phrase in your own sentence, “for a while”.
Answer:
Please wait for a while, I will come with you.

Question 3.
Add a prefix or suffix to make new words and use one of the root words in your own sentence:
1. ignore
2. achieve
Answer:
1. ignorance
2. achievement.
Sentence: We should not ignore our duties towards our motherland.

Question 4.
Complete the following sentences using your own words: (Answers are directly given.)
OR
Add a clause to expand the sentence meaningfully:
(One senteces will be asked in the activity sheet)
Answer:

1. He went on to prove that the pug marks found in the mud were not of a dog but of a tiger’s.
2. It was Sardar Patel who led the famous Bardoli Satyagraha.
3. This is where his decision went against him.
4. He did not know much about the customs of the Adivasis.

Personal Response:

Question 1.
Why do you think Faraday’s friend gave him a free ticket to Davy’s programme?
Answer:
I think, the friend knew that Faraday was poor and could not afford to buy a ticket for such a big programme. He also must be knowing about Faraday’s fascination about the subject of electricity, and that would be a great opportunity for him to attend the lecture of the renowned scientist Humphry Davy’s work on the subject chemicals and electrical lighting.

Question 2.
Is it necessary to have social status, money to pursue your goal? Explain why.
Answer:
I think it is not necessary to have social status or money to pursue our goal. Only that, you must have a dream to achieve the goal and continue to work hard towards it. You must keep on trying day and night with perseverance and sincerity.

Question 3.
Write what is implied in the following sentence: Even then Davy did not have much hope for Faraday. (What do the words ‘even then’ suggest?)
Answer:
Faraday wanted to be a great scientist. But Davy dismissed all his aspirations in the field of science. He made Faraday his secretary then his lab assistant. Faraday worked day and night and learnt about Davy’s experiments. Even after doing such hard work and getting knowledge and experience Davy was not hopeful about Faraday’s scientific career, because of his social status and education.

Question 4.
Write what is implied in the following sentence: People started telling Davy that of all his discoveries, the best was Faraday himself. (What does it suggest about Davy’s work?)
Answer:
Humphry Davy was a renowned chemist who made many discoveries about chemicals and electrical lighting. Faraday wanted Davy to become his mentor but Davy never believed in Faraday’s ability and always tried to keep him away from the experiments he was doing. Davy became jealous of Faraday when he became a celebrity scientist overnight. But Faraday did not receive recognition for his success from Davy. So people started telling Davy that Faraday himself was his best discovery.

Question 5.
Do you agree with Faraday’s following quotation? Explain with his own examples:
‘In order to succeed, your desire for success should be greater than your fear of failure’.
Answer:
Yes. I fully agree with Faraday’s quotation. He wants to say that if you want to get success you should never fear of failures. If your desire for success is greater than your fear of failures, you can definitely achieve your success with determination and perseverance. Davy asked him to reverse engineer Bavarian glass. He toiled hard but failed to do it. He had lost his memory but the disease did not stop him. His failures did not become obstacles in the way of his success.

Question 6.
When you wish to achieve some goal, does it matter what you are?
Answer:
No. When you wish to achieve some goal it does not matter who you are. You may not have status in the society or wealth or even education but still you can achieve your goal with hard work, perseverance, conviction, keen observation and intelligence.

Activity:

Question (a)
Information about 3 gadgets/instruments
Answer:
1. Telescopes:
A telescope is an optical instrument that aids the observation of remote objects by collecting electromagnetic radiation (such as visible light). The first known practical telescope was invented in Netherlands at the beginning of the 17th century, by using glass lenses. It has use in both terrestrial applications and astronomy. There are many types of telescopes, for example, radio telescope, X-ray telescope, optical telescope, etc. They are generally made up of two lenses placed at a fixed distance to enlarge far away images.

2. Fan:
A fan is a machine used to create flow within a fluid, typically a gas such as air. The fan consists of a rotating arrangements of blades which act on the fluid. The rotating assembly of blades and hub is I known as rotor. A fan concentrates the airflow in the required direction. The punkah fan was used in India about 500 BC. It was a handheld fan made of bamboo strips and other plant fibre. This evolved over the years to the modern fans we see in our rooms daily now.

3. Sewing machine:
It is a machine used to stitch fabric and other material together with a thread. Sewing machines were invented during the Industrial Revolution to decrease the amount of manual sewing work. In a modern sewing machine the fabric easily glides in and out without the inconvenience of needles and thimbles but the earlier sewing machines were partially manual and helped the tailor do the stitching faster saving his time.

Inventions

Question 1.
Choose any one machine or device and prepare a short note about it. Use the points given in margin of the textbook page no. 88.
Answer:

A Note on Fan

A fan is a machine/device used to create flow within fluid, typically a gas such as air. The fan consists of a rotating arrangement of blades that act on air concentrating the flow of air in one direction. The rotating assembly of blades and motor is known as rotor. Fans are powered by electricity. The ‘punkha’ (fan) was used in India about 500 BC. It was handheld fan made of bamboo. These fans evolved after centuries to the fans, we see today in our homes.

Balbharti Maharashtra State Board Class 9 English Solutions My English Coursebook Chapter 1.4 The Story of Tea Notes, Textbook Exercise Important Questions and Answers.

Maharashtra State Board Class 9 My English Coursebook Solutions Chapter 1.4 The Story of Tea

My English Coursebook Std 9 Digest Chapter 1.4 The Story of Tea Textbook Questions and Answers

Warming up!

Chit-chat:

• Can you make tea?
• How do you make tea?
• What brand do you like?
• At home, who makes tea/coffee for everybody?
• Have you seen a tea-plantation?
• What was it like?

Write the names of as many beverages as you can within two minutes. What do the following beverages remind you of? Draw word webs to show your associations.

Question 1.
Write the names of as many beverages as you can within two minutes. What do the following beverages remind you of? Draw word webs to show your associations.

Answer:

English Workshop:

1. List all the names of Geographical places mentioned in the passage.

Question 1.
List all the names of Geographical places mentioned in the passage.
Answer:
Assam, China, Cambod, Darjiling, Nilgiris.

2. Make smaller words using the letters in the given words. (At least 5 words each)

Question 1.
Make smaller words using the letters in the given words. (At least 5 words each)

• actually
• refreshing
• immediately
• investigations
• meditation
• enjoyable
• loneliness
• friendship

Answer:

1. actually – act, all, tall, call, ally.
2. refreshing – fresh, refresh, ring, sing, fin.
3. immediately – dial, ate, die, mat, date.
4. investigation – invest, nation, station, nest, vest.
5. meditation – tan, edition, meat, edit.
6. enjoyable – enjoy, able, joy, enables, noble.
7. loneliness – lone, one, line, nine, less.
8. friendship – friend, ship, end, fried, find
9. powdered – pod, were, red, owe, power
10. hospitality – hospital, spit, pity, host, hit.

3. From the passage, copy correctly any three sentences that begin with ‘How’.

Question 1.
From the passage, copy correctly any three sentences that begin with ‘How’.

4. Find the meanings of the following from a good dictionary :

Question 1.
Find the meanings of the following from a good dictionary :

• infusion
• restorative
• inscriptions
• radicals
• connoisseurs

5. List the words related to
(a) agriculture
(b) chemistry from this passage.

Question 1.
List the words related to
(a) agriculture
(b) chemistry from this passage.

6. Complete the following sentences with the help of the passage:

Question 1.

Complete the following sentences with the help of the passage:
(a) Camellia sinensis is an evergreen plant that grows in
(b) The teas we buy are usually classified according to
(c) In many countries around the world, tea drinking is an
(d) Our body produces chemicals called
Answer:
(a) Camellia sinensis is an evergreen plant that grows in tropical and sub-tropical climates.
(b) The teas we buy are usually classified according to the size of their leaves.
(c) In many countries around the world, tea drinking is an
(d) Our body produces chemicals called

7. Prepare a flow chart to show the growth and journey of tea from the plantation to our homes. Use information from the lesson.

Question 1.
Prepare a flow chart to show the growth and journey of tea from the plantation to our homes. Use information from the lesson.

Answer:

Language  Study:

8. From the passage, find all the words or pairs of words that begin with ‘tea’.
Examples: teapot, tea plants.
When two words come together to form a new word, the new word is called a compound word. What words do you see in the following compounds – evergreen, blood pressure, every day?
Note that some compound words are written as one word (teapot), some with a hyphen between them (tea-making) and some as two separate words (tea club).

9. Sometimes the form of a verb in a sentence names the action but does not change according to tense, number or person. Such a form is known as a non-finite form or an ui1lnitii. An infinitive is used with or without ‘to’.
Examples: How did people first begin to drink tea? Can you name the beverage?
Underline the infinitive in the following sentences.
It was funny to read words that stood still.
Can I read the book?
They could help one another with the homework and talk about it.
To be or not to be – that is the question.

My English Coursebook 9th Class Solutions Chapter 1.4 The Story of Tea Additional Important Questions and Answers

Read the following passage and do the activities:

Simple Factual Activity:

Question 1.
Complete the sentences using the information given in the passage:
(Answers are directly given.)
Answer:

1. The most popular beverage in the world is tea.
2. Tea plants require at least 100-125 cm of rainfall a year.
3. World’s famous tea estates are located on hill slopes.

Question 2.
Complete the following sentences using the information given in the passage :
(Answers are directly given.)
Answer:

1. Most people agree that tea is a refreshing drink.
2. Emperor Shennong was called the father of Chinese agriculture and medicine.
3. Bodhidharma found that chewing tea leaves acted as a stimulant.
4. Tea got its distinctive flavour by its theanine as well as caffeine.

Question 3.
Write whether the following statements are True or False :
(Answers are directly given.)
Answer:

1. The first Indian tea was sent to England for public sale in 1823. – False
2. Tea became a fashionable and popular drink in Europe. – True
3. Our body produces chemicals called free radicals. – True
4. The word ‘chai’ is now sometimes used in English to refer to China tea. – False

Question 4.
Complete the following sentences with the help of the information given in the passage :
(Answers are directly given.)
Answer:

1. In many countries around the world, tea drinking is an important social occasion.
2. Tea ceremonies give people the time to relax and enjoy the taste and smell of tea.
3. For many people tea is a popular drink to have with friends.
4. Koreans still have tea ceremonies on the occasions of special birthdays and anniversaries.

Question 5.
Choose the correct alternatives and complete the following sentences :
(Answers are directly given.)
Question a.
In Russia, tea is made and served in ………….. .
(a) cups
(b) pots
(c) samovars
Answer:
(c) samovars

Question b.
In Japan, tea is made using ……………… .
(a) a bamboo whisk
(b) sugar
(c) green tea
Answer:
(a) a bamboo whisk

Question c.
In India, tea is served as a token of ……………….. .
(a) love
(b) hospitality
(c) affection
Answer:
(b) hospitality

Question d.
In China, tea is made in small ………………. teapots.
(a) clay
(b) metal
(c) glass
Answer:
(a) clay

Complex Factual Activities:

Question 1.
Which geographical conditions (features) are required for growing tea plants?
Answer:
Tea plants require tropical and sub-tropical climates. They need at least 100-125 cm of rainfall and acidic soils. They grow well on hill slopes at elevations of up to 1500 metres where they acquire a richer flavour at that height.

Question 2.
Why are tea plants pruned?
Answer:
The tea plants are pruned and kept at height of about three feet to make it possible for them to ; pluck the tea leaves easily.

Question 3.
How is tea the beverage made?
Answer:
Tea is made by brewing, that is by infusing tea leaves in boiling water.

Question 4.
Complete the web:
(Answer are directly given.)
Answer:

Question 5.
Who was Emperor Shennong? Why did he carry out further investigations about tea?
Answer:
Emperor Shennong was the father of Chinese agriculture and medicine. On drinking the boiled water of tea leaves, he was amazed by the rich flavour and the refreshing quality of the infusion he was so excited that he decided to carry out further investigation.

Question 6.
Arrange the following sentences in proper order of their occurrence :
1. Japanese priests studying under Buddhist teachers in China carried tea seeds and leaves to Japan.
2. Turkish traders began to bargain for tea on the border of Mongolia.
3. Bodhidharma, a Buddhist monk introduced tea among his disciples in China.
4. The Chinese Emperor Hui Tsung failed to notice that Mongolia had actually taken over his empire.
Answer:
3. Bodhidharma, a Buddhist monk introduced tea among his disciples in China.
1. Japanese priests studying under Buddhist teachers in China carried tea seeds and leaves to Japan.
2. Turkish traders began to bargain for tea on border of Mongolia.
4. The Chinese Emperor Hui Tsung failed to notice that Mongolia had actually taken over his empire.

Question 7.
Complete the web :
(Answers are directly given.)
Answer:

Question 8.
Guess the origin of the Marathi word ‘Chaim’:
Answer:
Instead of earlier word ‘t’u’ Chinese started using ‘ch’a’ to describe tea. The word ‘Ch’a’ was close to the Hindi word ‘chai’ and was used all over India. Then slightly changed word ‘chaha’ was used in Marathi. It was the combination of the words ‘ch’a’ and ‘chai’ in Marathi version.

Question 9.
Complete the following choosing information from the passage :
Answer:

Question 10.
How do Indians like to have their tea?
Answer:
Most Indians like to have their tea hot with a good deal of milk and sugar in it. In the rainy season, tea is brewed with ginger to give it additional medicinal properties. Some others add spices like cardamom, cloves or mace to add to its taste and flavour. They have their morning and evening tea after spicy snacks. Some connoisseurs enjoy delicately flavoured jasmine tea, green tea, lemon tea and even iced tea.

Activities based on vocabulary:

Question 1.
Match the words in Column ‘A’ with their meaning in Column ‘B’:

‘A’	‘B’
1. aromatic	(a) any liquid for drinking
2. brew	(b) the hot regions of the world
3. beverage	(c) fragrant
4. tropical	(d) to make tea etc. by boiling

Answer:

‘A’	‘B’
1. aromatic	(c) fragrant
2. brew	(d) to make tea etc. by boiling
3. beverage	(a) any liquid for drinking
4. tropical	(b) the hot regions of the world

Question 3.
List the qualities of the special type of tea.
Answer:
unique in taste, aroma, strength, flavour.

Question 4.
Match the words in Column ‘A’ with their meaning in column ‘B’:

‘A’	‘B’
1. investigation	(a) a scientific examination for finding the truth.
2. stimulant	(b) a drink made by leaving shrubs (leaves), etc. in boiling water.
3. infusion	(c) making you strong and healthy again.
4. restorative	(d) a substance (tea) that helps you to stay awake.

Answer:

‘A’	‘B’
1. investigation	(a) a scientific examination for finding the truth.
2. stimulant	(d) a substance (tea) that helps you to stay awake.
3. infusion	(b) a drink made by leaving shrubs (leaves), etc. in boiling water.
4. restorative	(c) making you strong and healthy again.

Question 5.
Match the verbs in ‘A’ with the related phrases/words in ‘B’ from the passage:

‘A’	‘B’
1. reduce	(a) viruses in our body
2. control	(b) us live longer
3. fight	(c) the risk of cancer
4. help	(d) blood pressure

Answer:

‘A’	‘B’
1. reduce	(c) the risk of cancer
2. control	(d) blood pressure
3. fight	(a) viruses in our body
4. help	(b) us live longer

Question 6.
Write the words related to ‘medicine’ from the passage :
Answer:
cancer, blood pressure, viruses, antioxidants, free radicals, system, body, health, damage.

Question 7.
List the things from the passage that are used for making tea.
Answer:
powdered green tea, bamboo whisk, milk, sugar, ginger, spices like cardamom, cloves, mace, jasmine, lemon.

Activities based on contextual grammar:

Question 1.
Underline the adverbs from the following sentences :
(Answers are directly underlined.)
Answer:

1. Can you name the most widely consumed beverage in the world, after water?
2. The tree plants grow slowly.

Question 2.
Underline the infinitives in the following sentence:
(Answers are directly given.)
Answer:

1. It was funny to read words that stood still.
2. Do I have to read the book?
3. Turkish traders began to bargain for tea.
4. A servant was boiling some water for the king to drink.

Question 3.
Find the subject and the object from the following sentences :
1. The water immediately changed colour.
2. He carried out further investigations.
Answer:
1. Subject: The water: Object: colour
2. Subject: He; Object: investigations.

Question 4.
Underline the infinitives in the following sentences :
(Answers are directly underlined.)
Answer:

1. The word ch’a’ is used in English to refer to China tea.
2. Tea may be able to reduce the risk of cancer.

Question 5.
Choose the proper article from the given brackets to complete the sentences.
(Answers are directly given.)
Answer:
1. He has to attend an important meeting. (a, an)
2. He was looking at the setting sun. (the, a, an)

Question 6.
Replace the underlined words with another words and rewrite the sentences :

Question a.
The ceremonies give people the time to relax.
Answer:
The ceremonies give people the time to enjoy.

Question b.
For many people tea is a popular drink.
Answer:
For many people tea is a refreshing drink.

Question c.
Make any question using the wh-words given below:

1. Where
2. What
3. Who
4. When

Answer:

1. Where is our friend, Amar?
2. What shall we do now?
3. Who was there with you just now?
4. When will you meet me again?

Question 7.
Read the sentences and fill in the blanks with correct prepositions given in the brackets :
(Answers are directly given.)
Answer:

1. Tea is served in a small clay pot. (in, on, with)
2. The tea is mixed with boiled water using cloves, (for, with, at)
3. They still have tea ceremonies for important occasions, (for, to, in)
4. Some people use mace to add to its taste. (for, to, with)

Question 8.
Arrange the following words in correct order to frame sentences :
1. is tea cup of a offered guests to.
2. brewed ginger is Tea with.
Answer:
1. A cup of tea is offered to guests.
2. Tea is brewed with ginger.

Do as directed :

Question 1.
We have three different tea-growing regions in India. (Frame a Wh-question to get the underlined word as an answer.)
Answer:
How many different tea-growing regions are there in India?

Question 2.
Choose the correct form of the verb from the brackets :
(Answers are directly given.)
Answer:

1. A new flush appears on the plant every seven to ten days, (appear/appears)
2. Tea plants require at least 100-125 cm of rainfall a year, (require/requires)
3. Each of these regions is famous for the special type of tea. (is/are)
4. It is said that the tea plants grow slowly. (are/is)

Personal Response :

Question 1.
What are botanical names? How are they decided?
Answer:
Botanical names are actually scientific names. These names are according to binomial (two words) naming system. The first name tells us the genus of a plant and the second name is the species of the plant. Throughout the world there should be only one uniform name, that is why the scientific naming system is used.

Question 2.
What is the difference between legends or stories and history?
Answer:
Legends or stories may not be true but history tells you the facts and true events of the past. History is the written or recorded or spoken events of the past. They are concerned with the real persons, places, arts, etc. that really existed in the past whereas legends are mostly imaginary and passed down from generations to generations in the form of story telling. So they are likely to change but the events in history are generally unchangeable.

Question 3.
What is the difference between ‘claim’ and ‘fact’?
Answer:
The word ‘claim’ is used to say that something is true although it has not been proved or approved by all people totally. Fact means reality. It is used to refer that a particular situation or incident existed and considered to be true and that it can be proved as real.

Question 4.
Do you have any ceremonies associated with food items?
Answer:
There are no any ceremonies directly associated with particular food items. While celebrating marriage ceremony, house warming ceremony, anniversaries, etc. variety of food items are served by the hosts and people enjoy different food items with different flavours and tastes. When people celebrate the festivals of Holi, Diwali, Makar Sankrant etc. people particularly prepare and enjoy food items like puran poli, sweets, laddoos, tilgul, kheer, etc.

Question 5.
What is your favourite beverage? Tell your reasons :
Answer:
My favourite beverage is coffee. I love to have it because of its rich flavour and unique taste. I feel refreshed when I drink hot, slightly bitter coffee with brown colour.

Do as directed :

Question 1.
Complete the words by using correct letters :

1. j u _ c e
2. d _ i n k
3. s _ o p e
4. w o _ l d

Answer:

1. j u i c e
2. d r i n k
3. s l o p e
4. w o r l d

Question 2
Copy the following sentences in your notebook:
1. Japan, China, Russia and Korea have special tea ceremonies and traditions.
2. Can you name the most widely consumed beverage in the world, after water?

Question 3.
Put the following words in alphabetical order :
1. evergreen, acidic, flavour, beverage.
2. emperor, elevation, enable, establish.
Answer:
1. acidic, beverage, evergreen, flavour.
2. elevation, emperor, enable, establish.

Question 4.
Punctuate the following sentences :
1. are there any wild animals in this forest Sahil asked the tour guide
2. what a fantastic landscape it is the visitor exclaimed.
Answer:
1. “Are there any wild animals in this forest?” Sahil asked the tour guide.
2. “What a fantastic landscape it is !” the visitor exclaimed.

Question 5.
Spot the error and rewrite the correct sentences:
1. How and when did people first began to drink tea?
2. We has three very distinct and different tea growing regions in India.
Answer:
1. How and when did people first begin to drink tea?
2. We have three very distinct and different tea-growing regions in India.

Question 6.
Write related words as shown in the example :
(Answer is directly given.)
Answer:

Question 7.
Complete the following word-chain of nouns. Add four words, each beginning with the last letter of the previous word :
proteins → ……………. → …………… → …………….. → …………….
Answer:
proteins → sugar → remand → dream → mop.

Do as directed :

Question 1.
Make your own meaningful sentence by using the phrase ‘to look for’.
Answer:
Amav lost his pen in his school and now he is looking for it in his home.

Question 2.
Add a prefix or suffix to make new words and use any one of the root word in your own sentence :
1. confident
2. absent.
Answer:
1. confidence
2. absence.
Sentence: Ramesh was very confident when he began to give his speech.

Question 3.
Add a clause to expand the sentence meaningfully:
We know
Answer:
We know that trees are very important for all of us.

Language Study:

Question 1.
Compound word :
Find all the words or pairs of words that begin with ‘tea’.
Answer:
teapot, tea plants, tea gardens, tea-estates, tea leaves, tea seeds, tea-tasting, tea whisking, tea minded, tea growing, tea club, tea ceremony, tea kettle, tea lovers.

Question 2.
Underline the infinitive in the following sentences :
(The answers are underlined directly.)
Answer:

1. It was funny to read words that stood still.
2. To be or not to be – that is the question.
3. Can I read the book?
4. They could help one another with the homework and talk about it.

Balbharti Maharashtra State Board Class 9 English Solutions My English Coursebook Chapter 3.3 To a Butterfly Notes, Textbook Exercise Important Questions and Answers.

Maharashtra State Board Class 9 My English Coursebook Solutions Chapter 3.3 To a Butterfly

My English Coursebook Std 9 Guide Chapter 3.3 To a Butterfly Textbook Questions and Answers

Warming up:
Chit-chat:

1. What games did you play when you were a small child – in pre-primary or primary school?
2. Who were your playmates?
3. What do you remember best from that time?

Short Poems

Question 1.
Use the following formats to write your own poems.
noun
noun + verb
noun + verb + adverb
determiner/adjective + noun + verb + adverb
exclamation
noun + verb

If necessary, the teacher should revise the parts of speech mentioned the activity and write plenty of examples of each on the blackboard.
adjective 1
adjective 2
adjective 3
adjective 4
adjective 5
noun

verb
verb + adverb
verb + adverb + adverb
noun + verb + adverb + adverb
determiner/adjective + noun + verb + adverb + adverb
question (simple/rhetorical)

English Workshop:

Question 1.
Pick out from the first stanza, four expressions where the poet pleads with the butterfly not to go away:
Answer:

1. 1. STAY near me
   2. do not take thy flight!
   3. A little longer stay in sight!
   4. Float near me do not yet depart!

Question 2.
Match the words/lines and their meaning:

Words/Lines	Meaning
1. Do not take thy flight	(a) reminder of my childhood days
2. Much converse do I find in thee	(b) I want to talk to you about many things
3. Historian of my infancy	(c) Do not fly away
4. Dead time revive in thee	c I rushed upon the prey (butterfly)
5. A very hunter did I rush upon the prey	(e) In you, I see the time that has gone by

Answer:

Words/Lines	Meaning
1. Do not take thy flight	(c) Do not fly away
2. Much converse do I find in thee	(b) I want to talk to you about many things
3. Historian of my infancy	(a) reminder of my childhood days
4. Dead time revive in thee	(e) In you, I see the time that has gone by
5. A very hunter did I rush upon the prey	(e) I rushed upon the prey (butterfly)

3. Say WHO.

Question 1.
Say WHO.
Answer:
(a) Reminds the poet of his – butterfly childhood
(b) Is afraid to touch the butterfly – Poet’s sister
(c) Is like a hunter – the poet
(d) Is the poet’s sister – Emmeline

4. Sometimes, the normal word order is changed in the lines of a poem, to emphasise something or to make the lines sound better. This change in word order is called ‘inversion’.

Question 1.
Sometimes, the normal word order is changed in the lines of a poem, to emphasise something or to make the lines sound better. This change in word order is called ‘inversion’. Can you find examples of inversion in this poem? Write them down. Then rewrite the lines using regular word order and compare the effect.
Example: A little longer stay in sight!
Stay in sight a liitle longer.
Answer:
1. Much converse do I find in thee.
Regular word order: I do find much converse ! in thee.
2. You bring’st, gay creature as thou art!
A Solemn image to my heart, My father’s family!
Regular word order: As thou art gay creature you bringst a solemn image (of) my father’s family to my heart!

5. The rhyme scheme of the first stanza is a a b b c b c c b. Now write the rhyming words in the second stanza.

Question 1.
The rhyme scheme of the first stanza is a a b b c b c c b. Now write the rhyming words in the second stanza. Note the words ‘rush’, ‘bush’, ‘brush’. Their spellings look similar, but the pronunciation of the words is different. It is known as eye rhyme. Find examples of ‘eye rhymes’ and true rhymes from other sources.
Answer:

1. flight – sight,
2. depart – art – heart,
3. days – plays,
4. I – butterfly,
5. rush – brush,
6. springs – wings

My English Coursebook 9th Class Solutions Chapter 3.3 To a Butterfly Additional Important Questions and Answers

Simple Factual Activities:

Question 1.
Is the poet a grown-up person or a child?
Answer:
The poet is a grown-up person.

Poetic device Activities:

Question 1.
Write old English words used in the poem:
Answer:
Thy, thee, bring’st, thou, art.

Appreciation of Poem:

1. Title: ‘To a Butterfly’.
2. Poet: William Wordsworth.

3. Theme/Central Idea: The speaker of the poem (here, the poet himself) is a grown-up person who looks back to his childhood days. The sight of a butterfly reminds him of the pleasant childhood days he spent together with his sister chasing butterflies on the countryside. This is the theme of the poem.

4. Rhyme Scheme: The rhyme scheme of the first stanza is: aabbcbccb. The rhyme scheme of the second stanza is: aabbcacca

5. Figure of Speech: Inversion, Tautology.

6. Special Features: This poem is a lyric. A lyric poem expresses the mood or emotion of a single speaker. Here the poet himself, looks back to his childhood days with great fondness. The sight of a butterfly reminds him of the pleasant childhood days he spent with his sister chasing butterflies on the countryside.

7. Favourite Lines:

1. Stay near me-do not take they flight.
   A Little longer stay in sight.
2. Dead times review in thee.

8. Why I like the poem: I like this poem for its simplicity. The happy days of childhood are portrayed here with great effect in a few lines.

Short Poems

Question 1.
Use your own ideas, words to write your own poems:
Examples:
1. Rolling, roaring deep blue sea
We always long to visit and see.
2. Playing and laughing,
Heedless of everything,
We pass our childhood days,
Like colourful morning rays.

Balbharti Maharashtra State Board Class 9 English Solutions My English Coursebook Chapter 3.2 The Fall of Troy Notes, Textbook Exercise Important Questions and Answers.

Maharashtra State Board Class 9 My English Coursebook Solutions Chapter 3.2 The Fall of Troy

My English Coursebook Std 9 Guide Chapter 3.2 The Fall of Troy Textbook Questions and Answers

Warming up:
Chit-chat:

1. Do you know stories from any epics or mythological poems?
2. Who is your favourite mythological character? What do you like about that character?
3. Who is your favourite warrior?
4. If you could visit a place in the ancient world or the mytholocial world, which place would you choose? Which event would you like to see?

Building a Story

Form groups of eight. The group leader prepares slips of paper for each of the seven points given below and distributes them among the others. The group sits in a circle, taking their seats according to the number on the slip they have. Then each one completes the sentence on his/her slip without sharing it with the others. The group leader collects the slips and reads all the sentences aloud as one continuous passage. Does the story make sense? The group then works on the story to make it more meaningful and interesting.

1. Once there was a …………………………
2. Who lived in a …………………………
3. He/She ate …………………………
4. She/He went …………………………
5. There She/He saw …………………………
6. She/He was …………………………
7. That is why …………………………

Part – I

English Workshop:

1. Find antonyms of the following from the passage:

Question 1.
Find antonyms of the following from the passage: (Answers are directly given.)
Answer:

1. barren × fertile
2. surrender × attack
3. cowardly × brave
4. defenceless × safe
5. offended × pleased
6. peace × war
7. exposed × closed

2. Correct the following sentences using facts from the passage:

Question (a)
Troy traded in cattle and grass with other cities.
Answer:
Troy traded in goods and grain.

Question (b)
During war, Trojans jumped over the fort gates.
Answer:
During war, Trojans would close the doors of the fort.

Question (c)
Helen escaped with Menelaus.
Answer:
Helen eloped with Paris, a prince of Troy.

Question (d)
The Greek armies and heroes always defeated the Trojans.
Answer:
Sometimes the Greeks defeated the Trojans and sometimes the Trojans defeated the Greeks.

Question (e)
Both the enemies were eager to continue fighting.
Answer:
Both the armies were tired of war. The Trojans of being shut in their city and the Greeks of living away from home.

Question (f)
Troy was attacked because it was strong rich city.
Answer:
Troy was attacked because the Greeks wanted to take revenge on Troy for the wrong’done to their King Menelaus.

3. State the counteraction for the following actions:

Question (a)
Helen eloped with Paris.
Answer:
Counteraction: The Greeks wanted to take revenge on Troy they sailed and laid siege to the city of Troy.

Question (b)
The Greeks sailed to Troy and attacked it.
Answer:
Counteraction: The Trojans fought hard and the siege continued for ten long years.

Question (c)
Hector was killed by Achilles.
Answer:
Counteraction: Achilles himself was killed later on by a poisoned arrow that entered his heel, the only part of his body, where he could be wounded.

Question (d)
The siege continued for ten long years.
Answer:
Counteraction: The Trojans were tired of being shut up in their city and the Greeks deeply desired to see their homes again.

Question (e)
The fighting went on daily.
Answer:
Counteraction: Even then the siege did not end. The Greeks could not take the city, on the other hand, the Trojans could not force them to sail away back to Greece.

4. From either of our two Indian epics, find out which battle/war lasted the longest? Write down about its cause, the enemy armies, its heroes, its duration and the final outcome.

Question 1.
From either of our two Indian epics, find out which battle/war lasted the longest? Write down about its cause, the enemy armies, its heroes, its duration and the final outcome.
Answer:
Mahabharat
1. Cause: Kauravas took possession of the kingdom of Hastinapur forcibly, which rightfully belonged to Pandavas and they were not ready to give even an inch of the land to Pandavas. So, it led to the outbreak of the war.

2. The enemy armies:
Kauravas: 100 Kaurava brothers and many friendly kings like Shakuni, Shalya, Kama, etc. with their armies.
Pandavas: 5 Pandavas, Kashiraja, King Drupad, King Virat, Dhrushtadhyumna, etc. and their armies.

3. Heroes:

• Pandavas : Dharma (Yudhishthir), Arjun, Bhim, Nakul, Sahadev, Abhimanyu and Shri Krishna as the charioteer of Arjun.
• Kauravas: Duryodhan, Dushasan, Kama, Bhishmacharya, Dronacharya, Jaydrath.

4. Duration: The war lasted for eighteen days.

5. Final outcome: The war ended in victory to Pandavas. All mighty warriors from Kaurava side except Ashwathama were killed and it was a complete ruin for them. Pandavas regained Hastinapur.

5. Underline the subject in the following sentences:

Question 1.
Underline the subject in the following sentences:
(a) Paris had brought her to Troy.
(b) The Greeks waited to take revenge on Troy.
(c) The Greek armies sailed to Troy.
(d) The fighting went on daily.
(e) Reading is a good habit.

Here, we see that the ‘-ing’ form of the verb ‘fight’ is used as a subject in ‘The fighting went on’. It does the work of a noun. When the ‘-ing’ form of a verb is used as a noun, it is known as a gerund or verbal noun.

1. Gardening is an art.
2. Cooking is a science.
3. I enjoy reading poems.
4. I like writing, too.

Rewrite the above sentences using other appropriate gerunds in place of the ones given here.
Example: Speaking is an art.

1. Gardening is an art.
2. Cooking is a science.
3. I enjoy reading poems.
4. I like writing, too.
5. Swimming is a good exercise.
6. He is good at running.
7. I am fond of playing.
8. Travelling refreshes our minds.

Part – II

English Workshop:

1. Find and write the Greek and the Trojan names used in the story (Part I and II).

Question 1.
Find and write the Greek and the Trojan names used in the story (Part I and II).
Answer:
1. Greek names: Menelaus, Helen, Achilles, Odysseus, Agamemnon, Aphrodite (goddess).
2. Trojan names: Paris, Hector, King Priam.

2. List all the words related to ‘war’ from both parts of the story.

Question 1.
List all the words related to ‘war’ from both parts of the story.
Answer:
enemy, attack, fortress, ships, protect, defend, brave soldiers, heroes, kings, countries, revenge, siege, fighting, battles, killing, arrows, victory, engineer, peace, disaster, terror, death, conquerors.

3. Note the following constructions carefully and then use them to express your own ideas:

Question (a)
A horse big enough to hold men inside it.
……………. enough to …………… ………….
Answer:
A stick long enough to fell mangoes from the tree.

Question (b)
The Greeks were tired of the long war.
……………. tired of …………… ………….
Answer:
We are tired of the tedious work.

Question (c)
They are afraid of the long voyage home, too.
……………. afraid of …………… ………….
Answer:
They are afraid of the impending storm.

Question (d)
They made it too big to go inside your city.
……………… too ………………. to ……………….
Answer:
They bought a cupboard that was too big to go inside our house.

Question (e)
They were so excited that they paid no attention to his words.
……………….. so ………………. that ………………..
Answer:
We were so excited that we could not think of anything except our picnic.

4. Put the following events in the order in which they took place. Number then accordingly:

Question 1.
Put the following events in the order in which they took place. Number then accordingly:
Answer:
(a) The Trojans found a Greek man under the big wooden horse.  [1]
(b) They broke down a part of the wall and brought the horse in.  [3]
(c) The cunning Odysseus thought of a plan. [1]
(d) The Greeks burnt their tents and sailed away. [4]
(e) Troy was burnt down. [3]
(f) The Greeks built a big wooden horse. [2]
(g) The great heroes hid inside the horse. [3]
(h) The priest warned the Trojans not to break the wall.  [2]
(i) The Trojans were happy to see the Greek ships go. [5]
(j) The Trojans slept soundly.  [4]
(k) The Greek army entered the city. [2]

5. Form pairs. Imagine you are a pair of Trojans and you have come to know about Odysseus’s plan. Make a counter plan to defeat the Greeks. Write down your plan as you explain to your fellow Trojans:

Question 1.
Form pairs. Imagine you are a pair of Trojans and you have come to know about Odysseus’s plan. Make a counter plan to defeat the Greeks. Write down your plan as you explain to your fellow Trojans:
Answer:
While observing the large wooden horse, I heard some movements inside it. Friends, I am sure it is some trick to attack our city at night. Their great heroes must be inside the horse. They have not sailed away. They must be somewhere near and will return only when they will get the signal from the Greeks in the horse.

Friends, they will not get the signals from them. Look, we shall get bundles of ropes and tie the ropes tightly around the whole of the horse, so that no one would be able to come out and give signals. That Greek man also is in my custody. We shall arrange heavy barricades to close our wall gates. We shall take this opportunity to lift their siege.

We shall hold these heroes in the horse to ransom, in order to force them to lift the siege, surrender and leave our shore. Let’s come together and implement this plan immediately.

Language Study:

6. Refer to the Language Study pages and read the following entries:

Question (a)
Refer to the Language Study pages and read the following entries:

1. word
2. phrase
3. clause
4. sentence

Question (b)
A phrase is a meaningful group of words. Read the following phrases :

• the wise Odysseus
• a great horse of wood
• a skilful engineer
• the greatest heroes
• the secret of opening and shutting the entrance
• on the seashore outside the walls
• in the darkness
• watching for the return of the fleet
• part of their strong wall

Question 1.
Write three phrases on your own.
All the above phrases are parts of sentences they do not form a complete sentence by themselves. A sentence expresses a complete idea. You know that it has a subject and a predicate. A sentence has at least one finite verb in it.

Read the following examples:

• The tents had been burnt.
• The shore was deserted.
• The Greek ships had all gone.

2. Write three sentences using your own ideas.

Question (c)
When we read the story of ‘The Fall of Troy’, we see that here (as elsewhere), many sentences express two or more complete ideas linked together. For example,

1. When the Trojans dragged him out, the man pretended to be very frightened of them.
2. They wanted also to kill me and offer me as a sacrifice to the sea-god but I escaped and hid from them.
3. In the darkness the fleet sailed back, and the leading ship, which was Agamemnon’s, bore a red light high on its mast.

All these sentences consist of clauses. A clause has a subject and a verb. Some clauses can stand by themselves as a complete sentence.
Example: The man pretended to be frightened of them.

But some clauses do not make complete sense by themselves.
Example: When the Trojans dragged him out
It is only when we read the entire sentence that we understand what is being said.

Thus, we have seen that a clause is a part of a sentence and there are two types of clauses:
(a) Main clause – It can stand by itself.
(b) Subordinate or dependent clause : It depends on the main clause, and is incomplete without it.

Note that a sentence can have two or more main clauses or a main clause and one or more dependent clauses, but we cannot have a sentence without a main clause.

Question 3.
Identify one example of a main clause and one example of a dependent clause from page 74.

My English Coursebook 9th Class Solutions Chapter 3.2 The Fall of Troy Additional Important Questions and Answers

Simple Factual Activities:

Question 1.
Fill in the blanks with correct information from the passage. Choose the correct option from the brackets: (Answers are directly given.)
Answer:

1. Troy was a rich trading city in Asia Minor. (beautiful/trading)
2. Troy was a strong city protected by its wall. (Mount Ida/wall)
3. Troy was well situated for commerce and agriculture, (fertile fields/commerce and agriculture)
4. Helen was the wife of a Greek king Menelaus. (Paris/Menelaus)

Question 2.
Complete the following sentences using the information from the passage:
(Answers are directly given.)
Answer:

1. The Greek leaders decided to follow the advice of the wise Odysseus.
2. The Trojans thought that the long siege was over at last.
3. The last man who entered the wooden horse was the architect himself.
4. Troy was taken, not by force but by a trick.

Question 3.
State whether the following statements are True or False:
Answer:

1. The huge wooden horse was an offering to the god of the sea. – False
2. The man left by the Greeks told the false story of the horse. – True
3. Their wise priest told the Trojans not to make a hole in the wall. – True
4. The Greeks were tired of the long war and had sailed away. – False

Complex Factual Activities:

Question 1.
How did the location of Troy help it to grow into a very rich/prosperous city?
Answer:
The city was well situated for commerce and agriculture. Their ships sailed and carried goods and grain over the sea in front of the city. Many rivers and streams flowed from Mount Ida. Well-watered and fertile valleys among the hills grew corn in fertile fields cattle were reared on the rich grass of the meadows. So Troy became a rich/ prosperous city.

Question 2.
How were the Trojans protected?
Answer:
The Trojans had built a strong wall around their city to prevent the enemy attack from the sea. The great gates of the wall were kept closed in time of war. They were safe from all attacks by the walls surrounding the city as well as by the hills behind the city.

Question 3.
What was the cause of the ten year old war between the Greeks and the Trojans?
Answer:
Paris, a prince of Troy, had persuaded Helen, wife of a Greek king Menelaus, to elope with him. Paris brought her to Troy. The Greeks wanted to take revenge on Troy and laid siege to the city. The fight began and the war continued for ten long years.

Who were the brave heroes on either side who were killed in the war? How?

Question 1.
Who were the brave heroes on either side who were killed in the war? How?
Answer:
Great heroes on both sides were killed in the course of time. Hector was killed by Achilles. Achilles himself was killed later on by a poisoned arrow that entered his heel. The prince of Troy, Paris, was also killed by a poisoned arrow.

Question 2.
How did Odysseus plan to defeat the Trojans?
Answer:
Odysseus advised his men to build a great wooden horse, big enough to hold men inside it and let some of their best fighters hide in the horse. Then let them burn their tents and pretend to sail away in their ships. But instead of sailing away, they would return in the night. When the Trojans were asleep, they would attack the city and burn, kill and defeat the Trojans.

Question 3.
What was the reason for Trojans to rejoice and celebrate?
Answer:
The Trojans woke up and came out for fighting as usual. They were delighted and surprised what they saw on the seashore outside the walls. The tents of the Greeks were burnt, the shore was deserted so they thought that the long siege was over at last. They were sure that the Greeks had gone. They were glad to be free to go where they pleased. That was the reason for the Trojans to rejoice and celebrate.

Question 4.
How did the cunning Greek explain the presence of such a large wooden horse?
Answer:
The cunning Greek explained to the Trojans that the Greeks were tired of the long war and had sailed away in their ships. They were afraid of the long voyage home and so they made a large horse and left that as an offering to the god of the sea.

Question 5.
What reckless/thoughtless step did the Trojans take?
Answer:
Thinking that the horse would bring them good luck the Trojans broke down a part of their strong wall in order to drag the horse in the city and that brought the ruin of their city.

Activities based on vocabulary:

Question 1.
Write the words related to ‘Geography’ from the passage.
Answer:
Asia Minor, trading city, Aegean, Black Sea, agriculture, grain, peak of Mount Ida, rivers, streams, valleys, hills, fertile fields, cattle, grass, fortress, meadows.

Question 2.
Match the adjectives in Column ‘A’ with the nouns in Column ‘B’:

‘A’	‘B’
1. high	(a) fortress
2. brave	(b) peak
3. fertile	(c) fields
4. strong	(d) soldiers

Answer:

1. high – peak
2. brave – soldiers
3. fertile – fields
4. strong – fortress.

Question 3.
Write the words related to war from the passage.
Answer:
fighting, siege, force, battles, armies, heroes, I kill, defence, resist, poisoned arrow, wounded.

Question 4.
Find the nouns for the following adjectives from the passage :

1. skilful
2. cunning
3. wonderful
4. wooden

Answer:

1. engineer
2. Odysseus
3. piece of work
4. horse.

Question 5.
Write all the words ending with ‘-mg’ form of verbs:
Answer:
Sailing, being, opening, shutting, expecting.

Question 6.
Arrange the letters properly to make a meaningful word :

1. aagni
2. bndeih
3. rohse
4. seegi.

Answer:

1. again
2. behind
3. shore
4. siege

Question 7.
Write the meaningful sentences from the jumbled words:
1. the Greeks did a large such Why horse make?
2. wise their them priest warned not so to do.
Answer:
1. Why did the Greeks make such a large horse?
2. Their wise priest warned them not to do so.

Question 8.
Match the names of the persons in Column ‘A’ with the information in Column ‘B’:
Answer:

1. Agamemnon – sailing in the leading ship of Greeks
2. Aphrodite – a Greek goddess
3. Priam – Old Trojan King
4. Helen – wife of King Menelaus.

Question 9.
Write the phrases related to Greeks’ attack on Troy.
Answer:
Set fire to houses, burn and kill, sight of leaping flames, sound of shouting, noise of weapons, cries of weeping women, the sleeping Trojans taken by surprise, put on their armour, seize their weapons, went up in flames, all in vain.

Activities based on contextual grammar:

Question 1.
A prince of Troy had persuaded Helen.
(Begin with ‘Helen had – ’ and change the voice.)
Answer:
Helen had been persuaded by a prince of Troy.

Question 2.
The city was strongly defended by its brave soldiers. (Choose the correct option of Active voice)
(a) Its brave soldiers defended strongly by the city.
(b) Its brave soldiers defended the city strongly.
Answer:
Its brave soldiers defended the city strongly.

Question 3.
Underline the infinitives in the sentences:
(Answers are directly underlined.)
1. Paris persuaded Helen to elope with him.
2. The Greeks wanted to take revenge.

Question 4.
Greeks could not take the city. (Make the sentence affirmative.)
Answer:
Greeks were unable to take the city.

Question 5.
Every day Greeks came out of their gates. (Rewrite the sentence using Past Continuous tense.)
Answer:
Every day Greeks were coming out of their gates.

Question 6.
The Trojans, too, fought hard. (Add a question tag.)
Answer:
The Trojans, too, fought hard, didn’t they? ‘

Question 7.
Find the gerund from the sentence. The fighting went on daily.
Answer:
fighting.

Question 8.
They will return in the night. (Frame a Wh-question to get the underlined part as an answer.)
Answer:
When will they return?

Question 9.
They went to sleep.
(Write the sentence in Past Progressive tense.)
Answer:
They were going to sleep.

Question 10.
Why did the Greeks make such a huge horse?
(Rewrite the sentence using Past Perfect tense.)
Answer:
Why had the Greeks made such a huge horse?

Question 11.
The walls are no longer necessary.
(Add a question tag.)
Answer:
The walls are no longer necessary, are they?

Question 12.
The Greeks have gone.
(Rewrite the sentence using Simple Past tense.)
Answer:
The Greeks went.

Choose the correct alternative from the brackets and complete the following sentences:

Question 1.
Choose the correct alternative from the brackets and complete the following sentences:
(Answers are directly underlined.)
Answer:

1. They were killed with their great heroes. (with/for)
2. They found the car m their own garage. (on/in)
3. He jumped into the river to save the child. (over/into)
4. She was gazing at the strange person. (on/at)

Question 2.
Write the past tense and past participle forms of the following verbs:
(Answers are directly given.)
Answer:

Verb	Past tense	Past participle
come	came	come
lead	led	led
speak	spoke	spoken
swim	swam	swum

Complete the words by using correct letters:

Question 1.
Complete the words by using correct letters:

1. s _ ege
2. ro_nd
3. bra _ e
4. w_ong

Answer:

1. siege
2. round
3. brave
4. wrong

Copy the following sentences correctly in your notebook:

Question 1.
Copy the following sentences correctly in your notebook:
Answer:
1. The Greek wanted to take revenge on Troy for the wrong done to Menelaus.
2. “But why did the Greeks make such a huge horse?”

Put the following words in alphabetical order:

Question 1.
Put the following words in alphabetical order:
Answer:
1. fields, battles, ships, arrows
2. grain, grow, gates, Greek
3. arrows, battles, fields, ships.
4. gates, grain, Greek, grow.

Punctuate the following sentences:

Question 1.
1. Then he asked the boys where are you going children and for what
2. The king said what a strange appeal
Answer:
1. Then he asked the boys, “Where are you going, children, and for what?”
2. The King said, “What a strange appeal!”

Question 2.
Write four small words (minimum 3 letters each) using the letter in the given word :
“sometimes.”
Answer:

1. some
2. time
3. mime
4. tie

Question 3.
Spot the error and rewrite the correct sentences:
1. Great heroes on both sides was killed in the course of the war.
2. The Trojans came out of their gates, and the Greeks came out of their tents and ships and the fighting goes on.
Answer:
1. Great heroes on both sides were killed in the course of the war.
2. The Trojans came out of their gates, and the Greeks came out of their tents and ships and the fighting went on.

Question 4.
Write related words as shown in the example: (Answers are directly given.)
Answer:

Question 5.
Complete the following word-chain of nouns Add four words, each beginning with the last letter of the previous word:
Stream → ……………., ……………….., …………….., ……………..
Answer:
Stream → mountain → nature → electricity → years.

Question 6.
Make your own meaningful sentence by using the phrase ‘in front of.
Answer:
There is a big ground in front of our school.

Question 7.
Add a prefix or suffix to make new words and use any one of the root words in your own sentence:
1. imagine
2. education
Answer:
1. imaginary
2. educational
Sentence: Just try to imagine that you are a rich person.

Question 8.
Add a clause to expand the sentence meaningfully:
The person cried for help ………………
Answer:
The person cried for help because he was caught in the big fire.

Personal Response:

Question 1.
Do you know one of the wars in ancient India was fought over a woman? Describe it in short.
Answer:
I know such a war was fought between Ram and Ravan. Ravan, the demon king of Lanka, came in disguise as a Sadhu and forcefully took away Seeta, the wife of Ram. Ram with his monkey army reached Lanka. He fought against Ravan, defeated him and killed Ravan and brought back Seeta to Ayodhya.

Question 2.
Why, do you think, did the Greeks burn their tents?
Answer:
The Greeks burnt their tents to show the Trojans that they have left for Greece and did not wish to continue the siege any more. They wanted them (Trojans) to be careless and carefree about the Greek attack and their army.

Question 3.
Was it enough to use the wooden horse to hide some soldiers? What was done to make the Trojans take it inside the city?
Answer:
No, it was not enough to use it for hiding some soldiers. The Greeks wanted their entry into the city with all their army men. Unless the walls around the city were broken down they would not have got that opportunity. That’s why they made the horse very large and lured the Trojans to take it inside the city by breaking the walls.

Question 4.
Was the big wooden horse really an offering to the god of the sea?
Answer:
No, the big wooden horse really was not an offering to the god of the sea. It was a false tale of the Greek who was found under the big horse by the Trojans. It was told to lure the Trojans for taking the horse inside the city for sudden attack without their knowledge.

Question 5.
Why, do you think, were the Trojans so excited?
Answer:
I think, the Trojans thought that the siege by the Greeks was lifted and there would be no war any more. Again they thought that they were bringing in good luck for the city by presence of the wooden horse. They did not think of the impending danger.

Question 6.
Do you think that the conquerors of war are happy after their victory?
Answer:
No, I don’t think so. Both defeated and victorious countries have to bear the brunt of war. Both have to suffer because of the disastrous consequences they face. Both suffer the loss of lives, money, peace and so many other things. It takes a long time for both to regain their normal life.

Question 7.
Which of the following are the adverse effects of war? Tick [✓] them in the given box:
Answer:

1. Many people are killed. [✓]
2. The country gains fame and glory. [✗]
3. They lose peace in the land. [✓]
4. Thousands are wounded. [✓]
5. Soldiers enjoy fighting. [✗]
6. Those who win the war become rich and famous. [✓]

Oral Work

Question 1.
Read the story and retell it in your mother tongue, Read the following passage and do the activities:

Balbharti Maharashtra State Board Class 9 Science Solutions Chapter 11 Reflection of Light Notes, Textbook Exercise Important Questions and Answers.

Maharashtra State Board Class 9 Science Solutions Chapter 5 Acids, Bases and Salts

Class 9 Science Chapter 11 Reflection of Light Textbook Questions and Answers

1. Answer the following questions.

a. Explain the difference between a plane mirror, a concave mirror and a convex mirror with respect to the type and size of the images produced.
Answer:

	Plane mirror	Concave mirror	Convex mirror
Type of image	Virtual and Erect	Virtual (erect) as well as Real (inverted)	Virtual and Erect
Size of image	Same size	Diminished, Same size and magnified	Diminished

b. Describe the positions of the source of light with respect to a concave mirror in
1. Torch light
2. Projector lamp
3. Floodlight
Answer:
(a) Torch light: The source of light is placed at the focus.
(b) Projector lamp : The source of light is placed at the centre of curvature.
(c) Flood light : The source of light is placed just beyond the centre of curvature.

c. Why are concave mirrors used in solar devices?
Answer:

• Solar devices like solar cooker or solar water heater use solar energy to cook food or heat water.
• When sun rays fall on the concave mirror, they converge and come together in the focal plane.
• Due to convergence, the intensity of sun rays increases and the food or water is heated faster. Hence, concave mirrors are used in solar- devices.

d. Why are the mirrors fitted on the outside of cars convex?
Answer:

• A convex mirror is used as rear view mirror because they form erect, virtual, and diminished images.
• This, allows the driver to view a large area in a small mirror.

e. Why does obtaining the image of the sun on a paper with the help of a concave mirror burn the paper?
Answer:

• When sunrays fall on the concave mirror, they converge and come together in the focal plane.
• Due to convergence, the intensity of sunrays increases.
• Hence, image of the sun on a paper with the help of concave mirror bums the paper.

f. If a spherical mirror breaks, what type of mirrors are the individual pieces?
Answer:

• When a spherical mirror breaks into smaller pieces, the radius of curvature and focal length does not change.
• Hence, it will continue to behave like a spherical mirror only.

2. What sign conventions are used for reflection from a spherical mirror?
Answer:
According to the Cartesian sign convention, the pole of the mirror is taken as the origin. The principal axis is taken as the X-axis of the frame of reference. The sign conventions are as follows.

1. The object is always kept on the left of the mirror. All distances parallel to the principal axis are measured from the pole of the mirror.
2. All distances measured towards the right of the pole are taken to be positive, while those measured towards the left are taken to be negative.
3. The distance measured vertically upwards from the principal axis are taken to be positive.
4. The distance measured vertically downwards from the principal axis are taken to be negative.
5. The focal length of a concave mirror is negative while that of a convex mirror is positive.

3. Draw ray diagrams for the cases of images obtained in concave mirrors as described in the table on page 122.

Answer:
(a) A ray diagram for object at infinity for a concave mirror.

Image position	Nature of image
At focus	Real, inverted and point image

(b) A ray diagram for object beyond centre of curvature for a concave mirror.

An object beyond centre of curvature for a concave mirror

Image position	Nature of image
Between the centre of curvature and focus.	Real, inverted and diminished.

(c) A ray diagram for object at the centre of curvature for a concave mirror.

Object at centre of Curva fu re be a concave mirror.

Image position	Nature of image
At the centre of curvature.	Real, inverted and same size

(d) A ray diagram for object between F and C for a concave mirror.

Object between F & C for a concave mirror

Image position	Nature of image
Beyond the centre of curvature.	Real, inverted and magnified.

(e) A ray diagram for obj ect at focus for a concave mirror.

Object at focus for a concave mirror.

Image position	Nature of image
At infinity.	Real, inverted and highly magnified.

(f) A ray diagram for object between pole and focus for a concave mirror.

Image position	Nature of image
Behind the mirror.	Virtual, erect and magnified.

4. Which type of mirrors are used in the following?
Periscope, floodlights, shaving mirror, kaleidoscope, street lights, headlamps of a car.

Answer:

Objects	Type of Mirror
Periscope	Plane mirror
Floodlights	Concave mirror
Shaving mirror	Concave mirror
Kaleidoscope	Plane mirror
Street lights	Convex mirror
Head lamps of car	Concave mirror

5. Solve the following examples

a. An object of height 7 cm is kept at a distance of 25 cm in front of a concave mirror. The focal length of the mirror is 15 cm. At what distance from the mirror should a screen be kept so as to get a clear image? What will be the size and nature of the image?
Solution:
Given: Object size (h₁) = 7 cm
Object distance (u) = -25 cm
Focal length (f) = -15cm
To find: Image distance (u) = ?
Image size (h₂) = ?

The screen should be kept 373 cm in front of the mirror. The image is real.

The height of the image is 10.5 cm, it is an inverted and enlarged image.

b. A convex mirror has a focal length of 18 cm. The image of an object kept in front of the mirror is half the height of the object. What is the distance of the object from the mirror?
Solution:
Given: Image size (h₂) = ¹/₂ h₁
Focal length (f) = 18 cm
To find: Object distance (u) ?

The object is placed in front of the convex mirror at a distance of 18 cm.

c. A 10 cm long stick is kept in front of a concave mirror having focal length of 10 cm in such a way that the end of the stick closest to the pole is at a distance of 20 cm. What will be the length of the image?
Solution:
Given: Object size (h₁) = 10 cm
Object distance (u) = -20 cm
Focal length (f) = -10 cm

The height of the image is 10 cm and it is a real and inverted image.

6. Three mirrors are created from a single sphere. Which of the following:
pole, centre of curvature, radius of curvature, principal axis – will be common to them and which will not be common?
Answer:

• Centre of curvature and Radius of curvature will be common for all three pieces.
• Pole and Principal axis will not be common.

Class 9 Science Chapter 11 Reflection of Light Intext Questions and Answers

Class 9 Science Chapter 11 Reflection Of Light Question 1.
What is light
Answer:
Light is a form of electromagnetic radiation that produces the sensation of vision.

9th Class Science Chapter 11 Reflection Of Light Exercise Question 2.
What is a mirror?
Answer:
A mirror is a reflecting surface which reflects light and creates clear images.

9th Class Science Chapter 11 Reflection Of Light Exercise Answer Question 3.
Principal Focus of Concave and Convex Mirror.
Answer:

Principal Focus of the Concave Mirror	Principal Focus of the Convex Mirror
(i) Incident rays which are parallel to the principal axis of a concave mirror, after reflection from the mirror, meet at a particular point in front of the mirror on the principal axis. This point (F) is called the principal focus of the concave mirror. (ii) It is formed in front of the mirror. (iii) Focus of concave mirror is real.	(i) Incident rays parallel to the principal axis, after reflection, appear to come from a particular point behind the mirror lying along the principal axis. This point is called the principal focus of the convex mirror. (ii) It is formed behind the mirror. (iii) Focus of convex mirror is virtual.

9th Class Science Chapter 11 Reflection Of Light Notes Question 4.
If we hold a page of a book in front of a mirror, we see laterally inverted letters in the mirror. Why does it happen?
Answer:

• When we hold a page of a book in front of the mirror, the image of the words appear laterally inverted.
• The image of every point of the word is formed behind the mirror at the same distance from the mirror
• Because of this the left and right side of the image is interchanged.
• Hence, if we hold a page of a book in front of a mirror, we see laterally inverted letters in the mirror.

11 Reflection Of Light Exercise Question 5.
Which letters of the English alphabet form images that look the same as the original letters?
Answer:
A, H, I, M, O, T, U, V, W, X, Y

9th Science Chapter 11 Reflection Of Light Exercise Question 6.
When a person stands in front of a plane mirror, how is the image formed? What is the nature of the image?
Answer:

• The image of a person is formed from every point of the source, thereby forming an extended image of the whole source.
• The image formed would be virtual, upright and left-right reversed.

Answer the following questions:

Reflection Of Light Class 9 Questions And Answers Question 1.
Place two plane mirrors at an angle of 90a to each other. Place a small object between them. Images will be formed in both mirrors. How many images do you see? Now change the angle between the mirrors as given in the following table and count the number of images each time. How is this number related to the measure of the angle?
Answer:
The Relation between the angle between the mirrors and the number of images formed is given by
\(n=\frac{360^{\circ}}{\mathrm{A}}-1\)
n = number of images,
A = angle between the mirrors

Angle	Number of images
120°	2
90s	3
60®	5
45®	7
30®	11

Class 9 Science Chapter 11 Reflection of Light Additional Important Questions and Answers

Can you recall?

9th Class Science Chapter 11 Reflection Of Light Question 1.
What is meant by reflection of light and what are the types of reflection?
Answer:
The bouncing back of light when it hits an opaque surface is called reflection of light. The two types of reflection are regular and irregular reflection.

Reflection Of Light Class 9 Exercise Answers Question 2.
What are the laws of reflection.
Answer:

• The incident ray, reflected ray and normal all lie in the same plane at the point of incidence.
• The angle of incidence is equal to the angle of reflection.
• The incident ray and the reflected ray lie on opposite sides of the normal.

Choose and the correct option:

Class 9th Science Chapter 11 Reflection Of Light Question Answer Question 1.
If the reflected rays do not actually meet, such an image is called as image.
(a) real
(b) virtual
(c) magnified
(d) inverted
Answer:
(b) virtual

Class 9 Science Chapter 11 Reflection Of Light Exercise Solutions Question 2.
In a plane mirror, the perpendicular distance of the image from the mirror is equal to
(a) the perpendicular distance of the source from the object.
(b) the perpendicular distance of the source from the mirror.
(c) the parallel distance of the source from the object.
(d) the parallel distance of the source from the mirror.
Answer:
(b) the perpendicular distance of the source from the mirror

Reflection Of Light Class 9 Notes Pdf Maharashtra Board Question 3.
The image formed in a convex mirror is always
(a) virtual, smaller and behind the mirror
(b) virtual, smaller and in front of the mirror
(c) real, smaller and behind the mirror
(d) real, smaller and in front of the mirror
Answer:
(a) virtual, smaller and behind the mirror

Reflection Of Light Class 9 Solutions Question 4.
images can be displayed on a screen.
(a) Virtual
(b) Real
(c) Virtual and erect
(d) Virtual and inverted
Answer:
(b) Real

9th Class Science Chapter 11 Reflection Of Light Exercise Pdf Question 5.
A concave mirror is also called as a mirror.
(a) converging
(b) diverging
(c) plane
(d) outward curved
Answer:
(a) converging

9th Science Chapter 11 Reflection Of Light Question 6.
The centre of the mirror surface is called its
(a) pole
(b) centre of curvature
(c) principal axis
(d) focus
Answer:
(a) pole

Class 9 Science Chapter 11 Question Answer Reflection Of Light Question 7.
According to the new sign convention, the of the mirror is taken as origin.
(a) focus
(b) pole
(c) optical centre
(d) centre of curvature
Answer:
(b) pole

Class 9 Science Chapter 11 Reflection Of Light Exercise Question 8.
A convex mirror is also called as a mirror.
(a) converging
(b) plane
(c) diverging
(d) inward curved
Answer:
(c) diverging

Reflection Of Light Class 9 Maharashtra Board Question 9.
In order to see the full image of a person standing in front of a mirror, the minimum height of the mirror must be
(a) same height as that of the person
(b) double the height of the person
(c) half the height of the person
(d) quarter the height of the person
Answer:
(c) half the height of the person

Reflection Of Light Exercise 9th Class Question 10.
If the inner surface of the spherical mirror is reflecting, then it is a mirror, and if the outer surface is reflecting then it is mirror.
(a) convex, concave
(b) convex, plane
(c) concave, plane
(d) concave, convex
Answer:
(d) concave, convex

9th Std Science Chapter 11 Reflection Of Light Question 11.
The image formed by a concave mirror is
(a) always virtual and erect
(b) always virtual and inverted
(c) virtual if the object is placed between the pole and the focus
(d) virtual if the object is beyond the focus
Answer:
(c) virtual if the object is placed between the pole and the focus

Question 12.
No matter how far you stand from a spherical mirror, your image appears erect. The mirror may be
(a) plane
(b) concave
(c) convex
(d) either plane or convex
Answer:
(d) either plane or convex

Question 13.
In case of a concave mirror, an erect image is
(a) real and enlarged
(b) real and diminished
(c) virtual and diminished
(d) virtual and enlarged
Answer:
(d) virtual and enlarged

Question 14.
A rear view mirror of a car is
(a) plane mirror
(b) concave mirror
(c) convex mirror
(d) cylindrical mirror
Answer:
(c) convex mirror

Question 15.
An image of an object placed at infinite distance from a concave mirror is formed at
(a) the focus of the mirror
(b) behind the mirror
(c) centre of curvature
(d) infinity
Answer:
(a) the focus of the mirror

Question 16.
A ray of light parallel to principal axis after reflection from concave mirror passes through
(a) centre of curvature
(b) focus
(c) pole
(d) optical centre
Answer:
(b) focus

Question 17.
The image made by a plane mirror is a image.
(a) real
(b) virtual
(c) inverted
(d) diminished
Answer:
(b) virtual

Question 18.
The size of the image of an object placed at the focus of a concave mirror is
(a) erect
(b) very large
(c) same size
(d) diminished
Answer:
(b) very large

Question 19.
For virtual images, the height is while for real images, it is
(a) positive, positive
(b) negative, positive
(c) negative, negative
(d) positive, negative
Answer:
(d) positive, negative

Find the odd man out:

Question 1.
Torches, flood lights, head lamps of vehicles, rear view mirror.
Answer:
Rear view mirror – In rear view mirrors, convex . mirror is used. Concave mirrors are used in the rest.

Question 2.
Side mirrors of cars, parking mirrors, flood lights, mirror fitted in shops.
Answer:
Flood lights – In flood lights concave mirror is used. Convex mirrors are used in the rest.

Question 3.
Virtual and enlarged, virtual and diminished, real and inverted, real and magnified
Answer:
Virtual and diminished type of image is not formed by a concave mirror. All the other types of images are formed by a concave mirror.

Question 4.
Image is laterally inverted, image is of same size, image is at same distance, image is diminished.
Answer:
Image is diminished is not a characteristic of image formed in a plane mirror. Rest of them are characteristics of plane mirror.

Answer the following in one sentence:

Question 1.
What kind of mirror will a doctor use to concentrate on teeth, eyes, ears etc.?
Answer:
The doctor will use a concave mirror to concentrate on teeth, eyes, ears etc.

Question 2.
What do the nature, position and size of the image depend on?
Answer:
The nature, position and size of the image depend upon the distance of the object from the reflecting surface.

Question 3.
Give the expression for mirror formula.
Answer:
\(\frac{1}{v}+\frac{1}{u}=\frac{1}{f}\)

Question 4.
State any four uses of concave mirror.
Answer:
Concave mirrors are used in torches, headlights, shaving mirrors, dentists’ mirrors, solar devices etc.

Question 5.
What are the two types of spherical mirror?
Answer:
Convex mirror and concave mirror are the two types of spherical mirror.

Match the columns:

Question 1.

Column ‘A’	Column ‘B’
(1) Plane mirror	(a) Rear view mirror
(2) Concave mirror	(b) At laughing gallery
(3) Convex mirror	(c) At a hair dresser
(4) Irregular curved mirror	(d) At a dentist

Answer:
(1 – c),
(2 – d),
(3 – a),
(4 – b)

Question 2.

Column ‘A’	Column ‘B’
(1) Plane mirror	(a) Virtual and diminished image
(2) Concave mirror	(b) Virtual and same size image
(3) Convex mirror	(c) Real and inverted image

Answer:
(1 – b),
(2 – c),
(3 – a)

State whether the following statements are true or false. Correct the false statements:

(1) If the mirrors are kept at right angle to each other, then the number of images formed will be 4.
(2) A convex mirror is used in flood lights.
(3) A concave mirror always forms a magnified image.
(4) Images formed by convex mirrors are always virtual.
(5) The distance between the focus and the pole is called the radius of curvature.
(6) Reflection from a spherical mirror obeys laws of reflection.
(7) The reflecting surface of a concave mirror is curved.
(8) Distances measured in the direction of the incident light are taken as positive.
(9) If the image is erect, the height of the image is negative.
(10) A real image can be displayed on a screen.
(11) A concave mirror always forms a real and inverted image.
(12) Doctors use diverging beam of light to study teeth, ears and eyes.
Answer:
(1) False. if the mirrors are kept at right angle to each other then the number of images formed will be 3.
(2) False. a concave mirror is used in flood lights.
(3) False. a concave mirror can sometimes form a diminished image as well.
(4) True
(5) False. the distance between the focus and the pole is called the focal length.
(6) True
(7) True
(8) True
(9) False. if the image is erect, the height of the image is positive.
(10) True
(11) False. a concave mirror can also form a virtual and erect image.
(12) False. doctors use a converging beam of light to study teeth, ears and eyes.

Give scientific reasons:

Question 1.
A concave mirror is called a converging mirror.
Answer:

• When rays of light parallel to the principal axis are incident on concave mirror, they converge.
• After convergence, they meet at one point on the principal axis, hence concave mirror is called converging mirror.

Question 2.
Concave mirrors are used in torches and in car headlights.
Answer:

1. Concave mirrors are used in torches and car headlights because when a source of light is placed at the focus of a concave mirror, a parallel beam of light rays is obtained.
2. This helps us to see things upto a considerable distance in the darkness.

Question 3.
A dentist uses a concave mirror while examining teeth.
Answer:

• A concave mirror produces an erect, virtual and magnified image of an object placed between its pole and focus.
• A dentist uses this principle to get a clear and distinct image of teeth, hence, a dentist uses a concave mirror.

Solve the following numerlcals.

Tips for solving numerical:

• Object distance (u) is always -ve
• If Image distance (u) is +ve then image is behind the mirror and virtual. if u is -ve then image is in front of the mirror and real.
• Object height (h₁) is always +ve since it is erect.
• Image height (h₂) can be +ve for virtual and -ve for real.

Type – A

Question 1.
A bird is sitting in front of two plane mirrors inclined at an angle of 600 to each other. How many images does the bird see in the mirror?
Solution:
Given : Angle between mirror A = 60⁰
To find: Number of images formed n = ?

The brrd sees 5 images in the mirror.

Question 2.
A coin is kept in front of two plane mirrors inclined to each other. If 3 images of the coin are seen then what is the angle A between the mirrors?
Solution:
Given: no. of images formed n =3
To find: Angle between mirror A =?


The mirrors are inclined atan angle of 900 to each other.

Question 3.
An image is formed 5 cm behind a convex mirror of focal length 10 cm. At what distance is the object placed from the mirror?
Solution:
Given: Image distance (u) = 5 cm
Focal length (f) = 10 an
To find: Object distance (u) = ?

The object is placed at a distance of 10 cm in front of the mirror.

Question 4.
An object placed 20 cm in front of a convex mirror is found to have an image 15cm behind the mirror. Find the focal length of the mirror.
Solution:
Given: Object distance (u) = -20 cm
Image distance (u) = 15 cm
To find: focal length (f) = ?


The focal length of the convex mirror is 60 cm.

Numerical For Practice

Question 5.
An object is placed at a distance of 36 cm from a concave mirror of focal length 12 cm. Find the image distance.
Answer:
-18 cm

Question 6.
An arrow is placed at a distance of 25 cm from a diverging mirror of focal length 20 cm. Find the image distance.
Answer:
11.1 cm

Type – B

Question 1.
An object 4cm in height is placed at a distance of 36 cm from a concave mirror. The image is formed 18 cm in the front of the mirror. Find the height of the image.
Solution:
Given: Object height (h₁) = 4 cm
Image distance (u) = -18 cm
Object distance (u) = -36 cm
To find: Height of image (h₂) = ?

The height of the image is 2 cm and it is inverted.

Question 2.
An object 2 cm high is placed at a distance of 16cm from a concave mirror which produces a real image 3 cm high. Find the image distance.
Solution:
Given: Object height (h₁) = 2 cm
Object distance (u) = -16 cm
Image height (h₂) = -3 cm
To find: Image distance (u) = ?

The image is formed at a distance of 24 cm in front of the mirror.

Numericals For Practice

Question 3.
An object 10cm in height is placed at a distance of 36 cm from a concave mirror. 1f the image is formed at a distance of 18 cm in front of the mirror, find the height of the image.
Answer:
-5cm

Question 4.
A converging mirror forms a real image of height 4 cm of an object of height 1 cm placed 20 cm away from the mirror. Find the image distance.
Answer:
-80cm

Type – C

Question 1.
Rajashree wants to get an inverted image of height 5 cm of an object kept at a distance of 30 cm from a concave mirror. The focal length of the mirror is 10 cm. At what distance from the mirror should she place the screen? What will be the type of the image, and what is the height of the object?
Solution:
Given:
Focal length = f = -10 cm,
Object distance = u = -30 cm
Height of the image = h₂ = 7 cm
To find: Height of the object = h₁ = ?
Image distance = u =?

Rajashree has to place the screen 15 cm to the left of the mirror.
Magnification formula

The height of the object is 10 cm. Thus, the image will be real and diminished.

Question 2.
A 10 cm long stick is kept horizontally in front of the concave mirror having focal length of 10 cm in such a way that the end of the stick closest to the pole is at a distance of 20 cm. What will be the length of the image?
Solution:
The stick is kept parallel to the Principal axis. Distance between A and P is 20 cm. Say u₁ = 20 cm.
Hence, the other end of the stick is at distance, u₂ = (u₁ + 10) = 30 cm from pole of the mirror.

Using mirror formula for concave mirror,
Solution:

Here, negative signs indicate that images are formed on the left of the mirror.

The length of the image formed ?s given by, u = u₂ – u₁ = 15 – (-20) = 5cm.
The length of the image is 5 cm.

Numerical For Practice

Question 3.
An object 2 cm in height is placed at a distance of 16 cm from a concave mirror. If the focal length of the mirror is 9.6 cm., find the image distance, nature and size of the image.
Answer:
u = -24 an, h₂ = -3 cm; real, inverted and enlarged.

Question 4.
An arrow of 2.5cm height is placed at a distance of 25 cm from a diverging mirror of focal length 20 cm. Find the nature, position and size of the image formed.
Answer:
v = 11.1cm, h₁ = 1.1cm; virtual and in dimirrished form.

Define the following:

Question 1.
Centre of curvature of mirror (C)
Ans.
The centre of the sphere of which the mirror is a parte is called the centre of curvature of the mirror.

Question 2.
The radius of curvature (R)
Answer:
The radius of the sphere of which the mirror is a part, is called the radius of curvature of the mirror.

Question 3.
Pole (P)
Answer:
The centre of the mirror surface is called its pole.

Question 4.
The principal axis of a mirror
Answer:
The straight line passing through the pole and centre of curvature of the mirror is called its principal axis.

Question 5.
The focus of a concave mirror (F)
Answer:
Incident rays which are parallel to the principal axis of a concave mirror, after reflection from the mirror, meet at a particular point in front of the mirror on the principal axis. This point (F) is called the principal focus of the concave mirror.

Question 6.
Focus of a convex mirror (F)
Answer:
Incident rays parallel to the principal axis, after reflection, appear to come from a particular point behind the mirror lying along the principal axis. This point is called the principal focus of the convex mirror.

Question 7.
Focal length of a mirror (f)
Answer:
The distance (f) between the pole and the principal focus of the mirror is called the focal length. This distance is half of the radius of curvature of the mirror. \(f=\frac{R}{2}\)

Answer the following in short:

Question 1.
What are the rules for drawing ray diagrams for the formation of image by spherical mirror?
Answer:
The rules are as follows :

• If an incident ray is parallel to the principal axis, then the reflected ray passes through the principal focus.
• If an incident ray passes through the principal focus of the mirror, the reflected ray is parallel to the principal axis.
• If an incident ray passes through the centre of curvature of the mirror, the reflected ray traces the same path back.

Distinguish between:

Question 1.
Convex mirror and Concave mirror
Answer:

Convex mirror	Concave mirror
(i) In a convex mirror, the reflecting surface is on the outer side. (ii) It is called a diverging mirror. (iii) The focus of a convex mirror is virtual. (iv) It can form only a virtual image. (v) It can form only a diminished image.	(i) In a concave mirror, the reflecting surface is on the inner side. (ii) It is called a converging mirror. (iii) The focus of a concave mirror is real. (iv) It can form a real as well as a virtual image. (v) It can form an enlarged, diminished as well as the same size image.

Question 2.
Real image and Virtual image
Answer:

Real image	Virtual image
(i) A real image is formed only when the reflected rays actually meet at a point. (ii) Real images can be obtained on a screen. (iii) All real images are inverted.	(i) A virtual image is formed only when the reflected rays appear to meet at a point. (ii) Virtual images cannot be obtained on a screen. (iii) All virtual images are erect.

Answer the following questions:

Question 1.
If we keep the mirrors parallel to each other, how many images will we see ?
Answer:
When two mirrors are kept parallel to each other infinite images are formed, this is because light gets reflected infinite times.

Answer in detail:

Question 1.
What sign conventions are used for reflection from a spherical mirror?
Answer:

According to the Cartesian sign convention, the pole of the mirror is taken as the origin. The principal axis is taken as the X-axis of the frame of reference. The sign conventions are as follows.

• The object is always kept on the left of the mirror. All distances parallel to the principal axis are measured from the pole of the mirror.
• All distances measured towards the right of the pole are taken to be positive, while those measured towards the left are taken to be negative.
• Distance measured vertically upwards from the principal axis are taken to be positive.
• Distance measured vertically downwards from the principal axis are taken to be negative.
• The focal length of a concave mirror is negative while that of a convex mirror is positive.

Question 2.
Draw ray diagrams for the image obtained in convex mirrors.
Answer:

Image position	Nature of image
Behind the mirror.	(A) Virtual, (B) Erect (C) Diminished

Question 3.
In order to see the full image of a person standing in front of a mirror, the minimum height of the mirror must be half the height of the person. Explain.
Answer:

Proof:

1. In the figure, the point at the top of the head, the eyes and a point at the feet of a person are indicated by H, E and F respectively.
2. R and S are midpoints of HE and EF respectively.
3. The mirror PQ is at a height of NQ from the ground and is perpendicular to it. PQ is the minimum height of the mirror in order to obtain the full image of the person.

For this, RP and QS must be perpendicular to the mirror.

Minimum height of the mirror
PQ = RS
= RE + ES
\(=\frac{\mathrm{HE}}{2}+\frac{\mathrm{EF}}{2}=\frac{\mathrm{HF}}{2}\)
= Half of the person’s height.

Question 4.
Determine the sign of magnification in each of the 6 cases in the table and verify that they are same using formulae
\(\mathbf{M}=\frac{h_{2}}{h_{1}}\) and \(\mathbf{M}=\frac{-v}{u}\)
Answer:

Question 5.
Explain the images formed by concave mirrors with respect to position of the image and object and also the Nature and size of image
Answer:

Balbharti Maharashtra State Board Class 9 English Solutions My English Coursebook Chapter 3.4 Think Before You Speak! Notes, Textbook Exercise Important Questions and Answers.

Maharashtra State Board Class 9 My English Coursebook Solutions Chapter 3.4 Think Before You Speak!

My English Coursebook Std 9 Guide Chapter 3.4 Think Before You Speak! Textbook Questions and Answers

Warming up:
Chit-chat

1. Do you write a diary?
2. Do you write letters or notes to your friends and relatives?
3. Do you ever fight with your friends?
4. Do you have arguments with your family members?
5. What are the arguments about?

Read the following words which may be used in place of speak-

Question (a)
Tick the words you know and underline the ones that you do not know. Find their meaning and pronunciation from a good dictionary.
1. Which of these words have a positive meaning?
2. Which of these words suggest an unpleasant context?

Question (b)
Try to translate these words into your mother tongue to show the different shades of meaning.

English Workshop:

1. The same word can be used as a noun in some sentences and as a verb in others.

Question 1.
The same word can be used as a noun in some sentences and as a verb in others.
For example,
1. Many are the empty remarks. ………………. (Noun)
2. A wise man once remarked, …………………. (Verb)

Make two sentences of your own with each of the words given below, using the same word as a noun in one and as a verb in another:

Question (a)
Change:
Answer:
1. He experienced a big change in his life. (Noun)
2. She changed her mind and joined them. (Verb)

Question (b)
Show:
Answer:
1. The young boy hosted the television show. (Noun)
2. They showed us the way to the post office. (Verb)

Question (c)
throw:
1. The naughty boy throws stones at a dog. (verb)
2. The wicketkeeper could not catch the throw properly, (noun)

Question (d)
return:
1. He will return from Pune soon. (verb)
2. I shall meet him on his return from London.(noun)

Question (e)
benefit:
1. He invests money in the mutual fund so that he will be benefitted in future, (verb)
2. He is enjoying the benefits of his hard work and honesty, (noun)

2. Complete the following:

Question 1.
Complete the following:
(a) Our ears are like funnels because ………………….
(b) The two rows of teeth are like a fence because ………………
(c) The two lips are like a fence because ……………..
(d) Harsh words are like scattered bits of paper carried away by the wind because ………………..
Answer:
(a) Our ears are like funnels because there is no door with which you can close them.
(b) The two rows of teeth are like a fence because every word you speak must pass through this wall of teeth.
(c) The two lips are like a fence because before a word can be spoken, it has to pass, it has to pierce through these two w alls.
(d) Once you have spoken a word you cannot get it back.

3. Write a brief summary of the story of the young man and his spiritual teacher, making the young man the narrator:

Question 1.
Write a brief summary of the story of the young man and his spiritual teacher, making the young man the narrator:
You may begin as given below. ‘I went quickly to my spiritual teacher for advice
because I had ……………… (Now continue)
Answer:
The young man and his spiritual teacher I went quickly to my spiritual teacher for advice because I had hurt my friend with my harsh and unkind words. I wanted to make amends. My teacher gave me a sheet of paper and a pen and asked me to write all the harsh words I had spoken.

When I did so he asked me to tear it into small bits and then throw them out of the window. When I did that he ‘i asked me to collect as many hits of paper as I could. That was impossible but I gave a try but could not collect a single torn bit. The teacher told me, that is what happens with the spoken word. He advised me to think before I speak in anger.

4. Translate the following sentences into your mother tongue.

Question 1.
Translate the following sentences into your mother tongue.
(a) The first question we must ask ourselves before we speak is – is it true?
(b) The second question to ask is – is it pleasant?
(c) The third question according to Socrates is – is it useful?
Answer:
The three questions were – is it true?, is it pleasant?, is it useful? Socrates told the youth that they should ask the three questions and if they get affirmative answers to them, they can open their mouths to speak.

(a) About the first question – is it true? – he advised that they should not utter a single word if they are not sure about the truth of what they are saying. If you utter words without thinking, you will be the cause of the spreading untruth.

(b) About the second question – is it pleasant? – he advised that they should not pass empty, vain remarks that might hurt others. Leave these unpleasant words remain unspoken.

(c) About the third question – is it useful? – Socrates advised the youth that our words should bring comfort to others and help them. If they are sure about it they should go ahead and speak.

5. ‘A very wise man once remarked that of the unspoken word you are a master, of the spoken word, you are a slave.’

Question 1.
Read the following sentence.
‘A very wise man once remarked that of the unspoken word you are a master, of the spoken word, you are a slave.’

The sentence has two pairs of opposites – spoken and unspoken, and master and slave. The contrasting ideas make the sentence more effective. Putting together opposite or contrasting ideas in one sentence is a literary device. It is called antithesis.

Read the following examples of antithesis.

1. Give every man thy ear, but few thy voice.
2. Man proposes, God disposes.
3. Speech is silver, but silence is gold.
4. Patience is bitter, but it has a sweet fruit.

6. Find some examples of antithesis from your mother tongue and translate them into English.

Question 1.
Find some examples of antithesis from your mother tongue and translate them into English.
Answer:

1. Give food, clothes, etc. to your child, but never give your earnings.
2. Hard work is exhausting, but its benefits are pleasing.
3. Listen to people, but j do what your conscience says.
4. Money can buy everything, but not happiness.

7. We have seen that clauses are parts of a sentence, and they are classified as main and subordinate or dependent clauses. Dependent clauses can be further classified as follows according to the work they do in a sentence.

How do we decide whether a clause is a noun clause, an adjective clause or an adverb clause? There is a simple rule – we can replace an adverb clause with an adverb, an adjective clause with an adjective and a noun clause with a noun.

Look at the following examples:

• But I don’t know the answer. (Noun)
  But I don’t know what they want. (Noun clause)
• He told us a funny story. (Adjective)
  He told us a story that was funny. (Adjective clause)
• They went away. (Adverb)
  They went when you were talking to your friend. (Adverb clause)

Now complete the following on your own :

1. But I don’t know ……………………………..
2. He told us ………………………………………
3. They went ………………………………………

8. Think before you use! Name some ‘ready to eat’ and ‘ready to cook’ food items available in the market. Discuss the following in groups.

Question 1.
Think before you use! Name some ‘ready to eat’ and ‘ready to cook’ food items available in the market. Discuss the following in groups.
(a) Discuss whether it is necessary to use such items and why they are sold.
(b) Discuss the possible adverse effects of such food items.
(Students may use the following points)
Food items: burger, pasta, pizza, hot-dog, soups, noodles, etc.
Answer:
(a) Points: not necessary to use-people use them for a matter of convenience – different tastes other than home food – office-going, working people’s need – young children’s craze, ready and easy to eat – many customers – good sell – good income for the manufacturers.
(b) Points: adverse effects: kidney failure, obesity, blood pressure, overweight, heart attack.

5. Activity: Live English: Packs, packets, pouches, wrappers

1. Activity: Live English : Packs, packets, pouches, wrappers

Question (a)
Given above is the picture of an imaginary food item’s packet. Let us see how to ‘read’ the matter on the packet as a vigilant consumer. Look at the wrapper and complete the sentences.
Answer:

1. The name of the food item is noodles.
2. It is made by Monnie Foods Corporation Ltd., Pune.
3. It is a Veg food item. (Veg/Non-veg)
4. 
5. The ingredients of noodles are wheat flour, vegetable oil, salt, carbonates.
6. The date of packing is 27/6/2017 and the expiry date is not given.
7. It should be consumed before 8 months from the date of manufacturing.

Question 1.
Try and obtain more information about the various symbols printed on the packet:
Answer:

2. Discuss the following with the help of given points:

Question 1.
Why the ‘recipe’ is given on the packet:
Answer:
Points: to prepare recipe fast in simple and enjoyable way/manner, proper additives, water, etc. to manage timing-preparing the food item in short time without confusion.

Question 2.
Why the packet tells us to visit the website of the company :
Answer:
Points: for complaining about the bad food product – to enquire about another food products of the company – to get more information about the food item in the packet.

Question 3.
What ideas are used to make the packet attractive :
Answer:
Points: well designed – illustrations for making recipe – separate tables for ingradients, Nutrition facts and recipe – beautiful attractive writing – clear instructions.

Question 4.
How you will verify whether something is good for you to eat:
Answer:
Points: after reading information on the packet especially about ingredients and nutrition facts taste after having the food item – from reliability and genuineness of the manufacturer – popularity.

Question (b)
Collect the outer coverings of fast food items. Discuss the following points in groups and then write your observations in your notebook.
Answer:

1. ngredients
2. Manufactured by
3. Net weight
4. Veg or Non-veg
5. Recipe
6. Nutrition facts
7. MRP
8. Mfg. date
9. Website
10. Other instructions, if any

Question (c)
Work in groups and prepare an attractive wrapper or packet for any product of your choice. Prepare an advertisement for your product.

Question (d)
You want to convince the customer to buy your product. Prepare a conversation between you and the customer about it.
Answer:
Convincing a customer about a product

• Myself: Welcome to our shop. How can I help you?
• Customer: I want some quality fast food. My daughter is craving for it since morning!
• Myself: No problem Sir. We have variety of food items in our shop. But I shall insist you to buy this ‘Mineral Noodles’.
• Customer: I haven’t heard about this.
• Myself: Don’t worry Sir. I won’t give you any ordinary product. It is new and has become a craze in the market.
• Customer: What is special about it?
• Myself: Yes, I tell you. It’s a purely vegetarian t food, rich with important ingredients, rarely found in other products.
• Customer: What about the taste?
• Myself : Quite yummy. Children are greedy for it.
• Customer: Are there any chemical additives?
• Myself: Not at all, every ingredient is natural, healthy and nutritious. No complaint this date! Its recipe is simple, easy and can be prepared in five minutes. This will be your best choice. You won’t repent, and see the price – less than any renowned products. You must buy it. Customer: I believe your words. Pack me three packets of ‘Mineral Noodles’.
• Myself: Here they are!
• Customer: Thank you.
• Myself: Welcome, Sir.

Question (e)
Your younger sister wants to eat something tasty. You are telling her the recipe of one such food item. Prepare a dialogue about
Answer:
An Instant Recipe
(My younger sister comes to my study room asking for something to eat, since Mom isn’t at home.)

• Sister: Dada! I am really hungry. Can you help me make something tasty? Mother isn’t at home.
• Myself: I am studying right now, sis! But I surely can tell you a recipe that will delight your taste buds as well as fill your stomach.
• Sister: Thank you, Dada. So what I need to do. What will be the ingredients?
• Myself: Nothing fancy! You need a salty, crispy biscuit packet and slices of cheese and tomato ketchup.
• Sister: Here are them all. Anything else.
• Myself: Nothing! Now take two biscuits and cut the slice of cheese according to the size of the biscuits.
• Sister: Like this, right?
• Myself: That’s good! Now place the cheese slice between two biscuits and dip in ketchup. Your tasty, crispy, tummy filling delight is ready.
• Sister: It is so simple! And that’s really delicious, Dada. I’ll make more of these and will arrange in this plate for me and you to enjoy. Thank you!
• Myself: It’s my pleasure!

My English Coursebook 9th Class Solutions Chapter 3.4 Think Before You Speak! Additional Important Questions and Answers

Simple Factual Activity:

Question 1.
Complete the following:
(Answers are directly given.)
Answer:
1. Harsh words are like scattered bits of paper carried away by the wind because it is very difficult
to take them back.
2. The young man said that he had spoken very harsh and unkind words to his friend and he was deeply hurt.

Question 2.
Who said to whom?

1. “How can I make amends?”
2. “Go out into the street and collect the bits of | paper.”
3. “Write all the harsh things you said to him.”
4. “Learn to think before you speak in anger.”

Answer:

1. The young man said to his spiritual teacher.
2. The teacher said to the young man.
3. The teacher said to the young man.
4. The teacher said to the young man.

Complex Factual Activities:

Question 1.
What does the narrator tell you about the two fences that you have to pass before speaking a word?
Answer:
The narrator tells us that if you have to speak even a single word, that word must pass through two fences (walls). The first one is of our two rows of the teeth and the second is of our two lips. Before a word can be spoken, it has to pass/ pierce through these two fences or walls. Therefore we must think carefully before we utter a word or speak something.

Question 2.
What were a wise man’s thoughts about our spoken word?
Answer:
The wise man thought that you are the slave of your spoken word. Once you have spoken a word you cannot get it back whatever you do. Therefore you must be careful about the word that you choose for speaking. Once the word has left your lips, you will not be able to get it back; you cannot take it back; you cannot change it or control it.

Question 3.
How did the spiritual teacher teach a lesson to the young man about his harsh and unkind words to his friend?
Answer:
The teacher gave the young man a sheet of paper and a pen and asked him to write down all the harsh, unkind words he had spoken to his friend. When he had written, the teacher asked him to tear up the sheet of paper into many small bits and throw them out of the window. As he did this he asked him to collect all the tiny bits of paper.

The young man tried his best but could not collect a single torn bit of paper because they were scattered far and wide. The teacher told the young man that the spoken words are like the bits of paper; they cannot be taken back and advised him to think before he spoke.

Activities based on vocabulary:

Question 1.
Write from the passage the words related to our body parts :
Answer:
mouth, ears, teeth, lips

Question 2.
Write four words that have ‘un-’ as prefix:
Example: unspoken
Answer:
unaware, uncertain, uncommon, unclean

Question 3.
Match the following words in column ‘A’ with their antonyms in column ‘B’:

‘A’	‘B’
1. harsh	(a) easy
2. earlier	(b) narrow
3. difficult	(c) soft
4. wide	(d) later

Answer:

‘A’	‘B’
1. harsh	(c) soft
2. earlier	(d) later
3. difficult	(a) easy
4. wide	(b) narrow

Question 4.
Write any four adverbs each with ‘-ly’ that express
(a) anger and
(b) loving nature in our talk:
Answer:
(a) anger: harshly, angrily, rudely, nastily
(b) loving nature: sweetly, nicely, affectionately, kindly

Activities based on contextual grammar:

Do as directed:

Question 1.
Complete the words by using correct letters:

1. u _ ter
2. thi_k
3. mou _ h
4. s_ave

Answer:

1. utter
2. think
3. mouth
4. slave

Question 2.
Copy the following sentences correctly in your notebook:
Answer:
1. “I am afraid I’ve lost my friendship with him. How can I make amends?”
2. “Throw the bits out of this window,” the teacher told him.

Question 3.
Put the following words in alphabetical order:
1. statesman, fence, nature, anger
2. stammer, scatter, spoken, statesman.
Answer:
1. anger, fence, nature, statesman.
2. scatter, spoken, stammer, statesman.

Question 4.
Punctuate the following sentences:
1. this is what happens with the spoken words the teacher said
2. now tear up this sheet of paper into as many as small bits as you can the wise teacher said
Answer:
1. “This is what happens with the spoken words,” the teacher said.
2. “Now tear up this sheet of paper into as many as small bits as you can,” the wise teacher said.

Question 5.
Write four small words (minimum 3 letters each) using the letters in the given word.
‘mythological’.
Answer:

1. myth
2. log
3. logic
4. toil.

Question 6.
Spot the error and rewrite the correct sentences:
1. The ears is like funnels, open all the time.
2. Therefore, learn to thought before you speak in anger.
Answer:
1. The ears are like funnels, open all the time.
2. Therefore, learn to think before you speak in anger.

Question 7.
Write related words as shown in the example:(Answers are directly given.)
Answer:

Question 8.
Complete the following word-chain of adjectives. Add four words, each beginning with the last letter of the previous word:
difficult → …………… → …………….. → …………….. → …………………
Answer:
difficult → talkative → energetic constant → tanned.

Question 9.
Make a meaningful sentence by using the following phrase in your own sentence.
“to be afraid of”.
Answer:
Nowadays children are not afraid of ghosts and stories of ghosts.

Question 10.
Use prefix to or suffix to make new words and use any of the roots words in your own sentence :
1. correct
2. complete
Answer:
1. incorrect
2. incomplete.
Sentence: There was a complete silence in the class.

Question 11.
Make the following sentence bigger by adding a clause:
My village is a beautiful place ………………….
Answer:
My village is a beautiful place which is situated very close to the Konkan coast.

Personal Response:

Question 1.
Was Disraeli trying to give a scientific reason? Was he only trying to give a message in lighthearted but effective way?
Answer:
Disraeli was not trying to give any scientific reason about man having two ears and one mouth. It was good for mankind. If man had two mouths and one ear he would have talked more and listened less and appearance of his face would have strangely changed. He wanted to give a lighthearted and playful message that man should talk less and listen more.

Question 2.
Write the biological reasons why man’s ears and mouth have developed the way they are now.
Answer:
Ears are sense organs that interpret sounds. Two ears will function better by capturing sounds from everywhere. Mouth is basically for feeding in all animals. It should be a single one. It then leads to food pipe to carry swallowed food inside the body. With a single mouth, feeding is easier. However, ears should be two to gather all sound signals.

Question 3.
What do you do when someone speaks to you angrily. Do you also speak angrily?
Answer:
When someone speaks to me angrily, I try to keep my calm because I know that angry words lead to quarrels and fights. Fire of anger always takes a bad turn and becomes worst. I at first try to pacify the person talking harshly to me or then keep quiet without speaking a word with him.

Read the passage on the textbook page no. 83 about Socrates’ wisdom and his three questions and answer the following questions:

Question 1.
Who was Socrates?
Answer:
Socrates was one of the wisest men of the ancient world.

Question 2.
Who were influenced by his teachings?
Answer:
Many youths were influenced by his teachings.

Question 3.
What did he advise his disciples?
Answer:
He advised his disciples to keep their mouth shut and speak only when it is absolutely necessary.

Question 4.
Have you ever passed on an empty remark or vain statement that might hurt someone else? What can you do to avoid doing it again ?
Answer:
I was very proud of my fair colour. Once I, jokingly, passed some nasty remark on one of my friends, about his dark colour. He was greatly hurt and stopped talking with me; he started avoiding me and our friendship was lost.

I realised that I shouldn’t have passed such a vain remark. I have now decided to avoid passing such remarks. I can avoid speaking without thinking. I can stop jeering at others. I can change my attitude and speak sweetly and kindly to everyone.

Balbharti Maharashtra State Board Class 9 Maths Solutions covers the Practice Set 9.3 Geometry 9th Class Maths Part 2 Answers Solutions Chapter 9 Surface Area and Volume.

Practice Set 9.3 Geometry 9th Std Maths Part 2 Answers Chapter 9 Surface Area and Volume

Question 1.
Find the surface areas and volumes of spheres of the following radii
i. 4 cm
ii. 9 cm
iii. 3.5 cm (π = 3.14)
i. Given: Radius (r) = 4 cm
To find: Surface area and volume of sphere
Solution:
Surface area of sphere = 4πr²
= 4 x 3.14 x 4²
∴ Surface area of sphere = 200.96 sq.cm
Volume of sphere = \(\frac { 4 }{ 3 }\)πr³
= \(\frac { 4 }{ 3 }\) x 3.14 x 4²
∴ Volume of sphere = 267.95 cubic cm

ii. Given: Radius (r) = 9 cm
To find: Surface area and volume of sphere
Solution:
Surface area of sphere = 4πr²
= 4 x 3.14 x 9²
∴ Surface area of sphere = 1017.36 sq.cm

∴ Volume of sphere = 3052.08 cubic cm

iii. Given: Radius (r) = 3.5 cm
To find: Surface area and volume of sphere
Solution:
Surface area of sphere = 4πr²
= 4 x 3.14 x (3.5)²
∴ Surface area of sphere = 153.86 sq.cm
Volume of sphere = \(\frac { 4 }{ 3 }\) πr³
= \(\frac { 4 }{ 3 }\) x 3.14 x (3.5)³
∴ Volume of sphere = 179.50 cubic cm

Question 2.
If the radius of a solid hemisphere is 5 cm, then find its curved surface area and total surface area, (π = 3.14)
Given: Radius (r) = 5 cm
To find: Curved surface area and total surface area of hemisphere
Solution:
i. Curved surface area of hemisphere = 2πr²
= 2 x 3.14 x 5²
= 2 x 3.14 x 25
= 50 x 3.14
= 157 sq.cm.

ii. Total surface area of hemisphere = 3πr²
= 3 x 3.14 x 5²
= 235.5 sq.cm.
∴ The curved surface area and totai surface area of hemisphere are 157 sq.cm, and 235.5 sq.cm, respectively.

Question 3.
If the surface area of a sphere is 2826 cm² then find its volume. (π = 3.14)
Given: Surface area of sphere = 2826 sq.cm.
To find: Volume of sphere
Solution:
i. Surface area of sphere = 4πr²
∴ 2826 = 4 x 3.14 x r²
2826 = 282600 = 900
∴ \( r^{2}=\frac{2826}{4 \times 3.14}=\frac{282600}{4 \times 314}=\frac{900}{4}\)
∴ r² = 225
∴ r = \(\sqrt { 225 }\) … [Taking square root on both sides]
= 15 cm

ii. Volume of sphere = \(\frac { 4 }{ 3 }\) πr³
= \(\frac { 4 }{ 3 }\) x 3.14 x 15³
= \(\frac { 4 }{ 3 }\) x 3.14 x 15 x 15 x 15
= 4 x 3.14 x 5 x 15 x 15
= 14130 cubic cm.
∴ The volume of the sphere is 14130 cubic cm.

Question 4.
Find the surface area of a sphere, if its volume is 38808 cubic cm. (π = \(\frac { 22 }{ 7 }\))
Given: Volume of sphere = 38808 cubic cm.
To find: Surface area of sphere
Solution:

∴ r³ = 441 x 21 = 21 x 21 x 21
∴ r = 21 cm … [Taking cube root on both sides]
ii. Surface area of sphere = 4πr²
= 4 x \(\frac { 22 }{ 7 }\) x 21
= 4 x \(\frac { 22 }{ 7 }\) x 21 x 21
= 4 x 22 x 3 x 21
= 5544 sq.cm.
∴ The surface area of sphere is 5544 sq.cm.

Question 5.
Volume of a hemisphere is 18000π cubic cm. Find its diameter.
Given: Volume of hemisphere = 1 8000π cubic cm.
To find: Diameter of the hemisphere
Solution:
i. Volume of hemisphere = \(\frac { 2 }{ 3 }\) πr³

= 9000 x 3
∴ r³ = 27000
∴ r = \(\sqrt [ 3 ]{ 27000 }\) … [Taking cube root on both sides]
= 30 cm

ii. Diameter = 2r
= 2 x 30 = 60 cm
∴ The diameter of the hemisphere is 60 cm.

Maharashtra Board Class 9 Maths Solutions

Balbharti Maharashtra State Board Class 9 Science Solutions Chapter 7 Energy Flow in an Ecosystem Notes, Textbook Exercise Important Questions and Answers.

Maharashtra State Board Class 9 Science Solutions Chapter 7 Energy Flow in an Ecosystem

Class 9 Science Chapter 7 Energy Flow in an Ecosystem Textbook Questions and Answers

1. Complete the following table (Carefully study the carbon, oxygen and nitrogen cycles).

Bio-geo-chemical cycles	Biotic processes	Abiotic processes
1. Carbon cycle
2. Oxygen cycle
3. Nitrogen cycle

2. Correct and rewrite the following statements and justify your corrections.
a. Carnivores occupy the second trophic level in the food chain.
b. The flow of nutrients in an ecosystem is considered to be a ‘one-way’ transport.
c. Plants in an ecosystem are called primary consumers.

3. Give reasons.
a. Energy flow through an ecosystem is ‘one way’.
Answer:

• The Sun is the most important source of energy in any ecosystem.
• Green plants of the ecosystem store some amount of solar energy in the form of food.
• Before reaching the decomposers, this energy is passed on from one trophic level to the next.
• Decomposers dissipate some amount of energy in the form of heat.
• However, no part of the energy ever returns to the Sun. Hence, energy flow through an ecosystem is ‘one way’.

b. Equilibrium is necessary in the various bio-geo-chemical cycles.
Answer:

• The cyclic flow of nutrients within an ecosystem is called bio-geo-chemical cycles.
• Nutrients, necessary for the growth of organisms are continuously transferred from abiotic to biotic factors and biotic to abiotic factors within an ecosystem.
• Any imbalance in the cycles will break the link between the biotic and abiotic factors.
• Therefore, equilibrium is necessary between bio-geo-chemical cycles.

c. Flow of nutrients through an ecosystem is cyclic.
Answer:

• All organisms need nutrients for their growth.
• The nutrients carbon, oxygen, nitrogen, iron, calcium etc. are circulated and recycled from the biosphere to living organisms and after their death back to the biosphere.
• Nutrients are taken up by plants and then passed on to the consumers.
• Eventually, after their death, all types of consumers, are decomposed by decomposers like bacteria and fungi and the nutrients are again released into the biosphere and are, used again by living organisms.

Therefore, the flow of nutrients through an ecosystem is cyclic.

4. Explain the following cycles in your own words with suitable diagrams.
a. Carbon cycle.

Answer:

• The circulation and recycling of carbon from the atmosphere to living organisms and after their death back to the atmosphere is called the carbon cycle.
• Abiotic carbon atoms are circulated and recycled into biotic form mainly through photosynthesis and respiration.
• Hence, the carbon cycle is one of the important bio-geochemical cycles.
• Plants convert carbon dioxide into carbohydrates by the process of photosynthesis.
• Similarly, they produce carbon compounds like proteins and fats, too.
• Carnivores feed upon herbivores. In this way, biotic carbon is transported from plants to herbivores, from herbivores to carnivores and from carnivores to apex consumers.
• Main processes in the carbon cycle
  
• Eventually, after death, all types of consumers, are decomposed by decomposers like bacteria and fungi and carbon dioxide is released again into the atmosphere and is used again by living organisms.
• In this way, carbon is continuously passed on from one living organism to another. After the death of living organisms, carbon goes to the atmosphere and is again taken up by living organisms.

b. Nitrogen cycle.
Answer:

• Nitrogen forms 78% i.e. the maximum portion of the atmosphere. It is necessary for the maintenance of the cycle of nature.
• The circulation and recycling of nitrogen gas into the form of different compounds through various biotic and abiotic processes in nature is called the nitrogen cycle.
• All organisms participate in the nitrogen cycle. It is an important component of proteins and nucleic acids.
• As compared to other elements, it is inactive and does not easily combine with other elements. Most organisms cannot use the free form of nitrogen.
• Important processes of nitrogen cycle:
  (a) Nitrogen fixation: Conversion of nitrogen into nitrates and nitrites through atmosphere, industrial and biological processes.
  (b) Ammonification: Release of ammonia through the decomposition of dead bodies and excretory wastes of organisms.
  (c) Nitrification: Conversion of ammonia into a nitrite and then nitrate.
  (d) Denitrification: Conversion of nitrogen compounds into gaseous nitrogen.

c. Oxygen cycle.
Answer:

1. Oxygen forms 21% of the atmosphere. It is also present in the hydrosphere and lithosphere. The circulation and recycling of oxygen within the biosphere is called the oxygen cycle.
2. This cycle, includes both the biotic and abiotic components. Oxygen is continuously produced as well as used up in the atmosphere.
3. Oxygen is highly reactive and it readily reacts with other elements and compounds.
4. As oxygen is found in various forms like molecular oxygen (Oz), water (H,0), carbon dioxide (C02), inorganic compounds etc, the oxygen cycle of the biosphere is extremely complex.
5. Oxygen is released in the process of photosynthesis, whereas it is used up in processes like respiration, combustion, decomposition, corrosion, rusting, etc.

5. What would you do to help maintain the equilibrium in the various bio-geochemical cycles? Explain in brief.
Answer:

• Bio-geo-chemical cycles always involve the achievement of equilibrium, i.e., a balance in the cycling of the nutrients between the spheres.
• Human activities that are known to be environmentally unfriendly can disrupt this balance.
• We should avoid deforestation as trees play an important role in maintaining the balance.
• We should avoid overuse of fertilizers. The fertilizers get washed away in the nearby water bodies disrupting the balance.
• Avoid burning of fossil fuels as these fuels release a large amount of carbon in the form of carbondioxide, thus disrupting the balance.
• Vehicular emissions is another contributor to the disruption in balance of the various cycles.
• These emissions release oxides of nitrogen and carbon and other hazardous air pollutants.
• So, we must use better quality fuel like CNG or ethanol to reduce vehicular emissions.

6. Explain in detail the inter-relationship between the food chain and food web.
Answer:

• Interaction go on continuously between producers, consumers and decomposers.
• There is a definite sequence in these interactions which is called the food chain.
• Each chain consists of four, five or more links.
• An ecosystem consists of many food chains that are interconnected at various levels. Thus, a food web is formed.
• An organism may be the prey for many other organisms.
• For example, an insect feeds upon leaves of various plants but the same insect is the prey for different animals like frog, wall lizard, birds, etc.
• Thus, many food chains interconnected together form an intricate web called as food web.

7. State the different types of bio-geochemical cycles and explain the importance of those cycles.
Answer:

• The different types of bio-geo-chemical cycles are nitrogen, oxygen, carbon, water vapour, iron, calcium, phosphorus, etc.
• Nutrients, necessary for the growth of the organisms are continuously transferred from abiotic to biotic factors and biotic to abiotic factors within an ecosystem.
• These cycles operate continuously through the medium of the biosphere formed by the lithosphere, atmosphere and hydrosphere.
• (iv) The recycling of biological, geological and chemical sources of nutrients takes place through these cycles.
• Nutrients from the biosphere enter the bodies of plants and animals. Eventually, after death, all types of consumers are decomposed by decomposers like bacteria and fungi and they are again released into the biosphere and are used again by living organisms.
• Therefore, these cycles help in maintaining the flow of nutrients and energy through ecosystem and maintaining the equilibrium in the ecosystem.

8. Explain the following with suitable examples.
a. What type of changes occur in the amount of energy during its transfer from plants to apex consumers?
Answer:

• Plants of the ecosystem store some of the solar energy in the form of food.
• Before reaching the decomposers, this energy is passed on from one trophic level to the next.
• At every trophic level, some amount of energy is used by the organism for its own life processes and some amount of energy is lost to the surroundings.
• Decomposers dissipate some amount of energy in the form of heat.
• However, no part of the energy ever returns to the Sun. Hence, such passage of energy is referred to as ‘one way’ transport.
• Therefore, energy is maximum at the base of the pyramid and is least at the apex, e.g.
• phytoplanktons which form the base of the pyramid have 10,000 kcal of energy while humans at the apex have 10 kcal of energy.

b. What are the differences between flow of matter and of energy in an ecosystem? Why?
Answer:

Flow of matter	Flow of energy
(i) It involves the circulation and recycling of nutrients in a cyclic manner within the biosphere.	(i) It involves the flow of energy from one trophic level to another in a unidirectional or non-cyclic manner.
(ii) There is no dissipation of matter at any level.	(ii) There is the dissipation of energy at every level.
(iii) Biosphere is the source of nutrients.	(iii) The Sun is the most important source of energy.

Class 9 Science Chapter 7 Energy Flow in an Ecosystem Intext Questions and Answers

Can you recall?

7 Energy Flow In An Ecosystem Exercises  Question 1.
What is meant by nitrogen fixation?
Answer:
The process of conversion of Nitrogen into nitrates and nitrites is called Nitrogen fixation.

Energy Flow In An Ecosystem Class 9 Questions And Answers Question 2.
Which microbes bring about the process of nitrogen fixation?
Answer:
Rhizobium present in the root nodules of the leguminous plant bring about the process of nitrogen fixation.

Class 9 Science Chapter 7 Energy Flow In An Ecosystem Question 3.
What is meant by ‘ecosystem’?
Answer:
An ecosystem includes all of the living things like plants, animals and other organisms in a given area, interacting with each other and also with non-living environmental factors like weather, earth, sun, soil, climate and atmosphere.

Energy Flow In An Ecosystem Class 9 Exercise 1Question 4.
Which are different types of ecosystems?
Answer:

Class 9 Science Chapter 7 Energy Flow In An Ecosystem Exercise Question 5.
How do interactions take place between biotic and abiotic factors of an ecosystem?
Answer:

• Abiotic factors include non-living factors such as soil, water etc. and biotic factors include all living organisms.
• Both these abiotic and biotic ecosystems are connected through various bio-geo-chemical cycles.
• These connections/interactions are important for the flow of matter and flow of energy.

Class 9 Science Chapter 7 Energy Flow in an Ecosystem Additional Important Questions and Answers

Choose and write the correct option:

Question 1.
An intricate network of food chains is called
(a) Biosphere
(b) Food web
(c) Energy pyramid
(d) Ecosystem
Answer:
(b) food web

Question 2.
Fungi and other microbes are called
(a) Producers
(b) Consumers
(c) Decomposers
(d) Omnivores
Answer:
(c) decomposers

Question 3.
Oxygen forms of the atmosphere.
(a) 78%
(b) 21%
(c) 10%
(d) 90%
Answer:
(b) 21%

Question 4.
Microbes which do not need oxygen are called
(a) Producers
(b) Aerobes
(c) Anaerobes
(d) Decomposers
Answer:
(c) anaerobes

Question 5.
The pattern of energy exchange in an ecosystem is called a
(a) Food chain
(b) Food web
(c) Pyramid of energy
(d) Trophic levels
Answer:
(c) Pyramid of energy

Question 6.
Carbon atoms are circulated and recycled through
(a) Nitrification and denitrification
(b) Photosynthesis and respiration
(c) Respiration and nitrification
(d) Photosynthesis and ammonification
Answer:
(b) photosynthesis and respiration

Question 7.
Conversion of ammonia into a nitrite and then nitrate is called
(a) Nitrogen fixation
(b) Denitrification
(c) Nitrification
(d) Ammonification
Answer:
(c) nitrification

Question 8.
The conversion of nitrogen compounds into gaseous nitrogen is called
(a) Nitrogen fixation
(b) Denitrification
(c) Ammonification
(d) Nitrification
Answer:
(b) denitrification

Question 9.
is an important component of proteins and nucleic acids.
(a) Carbon
(b) Nitrogen
(c) Phosphorus
(d) Oxygen
Answer:
(b) Nitrogen

Question 10.
Amount of matter and energy from the lowest level to the highest level.
(a) decreases
(b) increases
(c) remains the same
(d) multiplies
Answer:
(a) decreases

Question 11.
is the most important source of energy in any ecosystem.
(a) The Sun
(b) The Moon
(c) Producers
(d) Decomposers
Answer:
(a) The Sun

Question 12.
Flow of energy in an ecosystem is
(a) cyclical
(b) two way transport
(c) o ne way transport
(d) to and fro transport
Answer:
(c) one way transport

Question 13.
The Indian Institute of Ecology and Environment, Delhi, has published
(a) Invasive species in a changing Environment
(b) Encyclopaedia of Ecology and Environment
(c) Environment and Ecology Magazine
(d) Biodiversity and Disaster Management
Answer:
(b) Encyclopaedia of Ecology and Environment

Question 14.
Oxygen is released in the process of
(a) Respiration
(b) Decomposition
(c) Combustion
(d) Photosynthesis
Answer:
(d) photosynthesis

Question 15.
cycle is a gaseous cycle.
(a) Carbon
(b) Phosphorus
(c) Calcium
(d) Iron
Answer:
(a) Carbon

Question 16.
is a sedimentary cycle.
(a) Carbon
(b) Nitrogen
(c) Oxygen
(d) Calcium
Answer:
(d) Calcium

Question 17.
is a primary consumer.
(a) Elephant
(b) Frog
(c) Owl
(d) Tiger
Answer:
(a) Elephant

Question 18.
is a secondary consumer.
(a) Grasshopper
(b) Elephant
(c) Frog
(d) Human
Answer:
(c) Frog

Question 19.
Tiger is a /an
(a) Producer
(b) Primary consumer
(c) Apex consumer
(d) Secondary consumer
Answer:
(c) apex consumer

Question 20.
Carbon dioxide is released into the atmosphere through
(a) burning of fossil fuels
(b) volcanic activity
(c) respiration
(d) all of these
Answer:
(d) all of these

Question 21.
in 1942 studied the food chain and energy flow through it
(a) Linderman
(b) Darwin
(c) Calypso
(d) Chu win lee
Answer:
(a) Linderman

Question 22.
fter the death of apex consumers, energy becomes available to.
(a) Decomposers
(b) Producers
(c) Herbivores
(d) Carnivores
Answer:
(a) Decomposers

Question 23.
Green plants of the ecosystem store in the form of food.
(a) Solar energy
(b) Chemical energy
(c) Thermal energy
(d) Electrical energy
Answer:
(a) Solar energy

Question 24.
Plants convert carbon dioxide into by the process of photosynthesis.
(a) Carbohydrates
(b) Proteins
(c) Fats
(d) Vitamins
Answer:
(a) Carbohydrates

Question 25.
Carnivores feed upon
(a) Decomposers
(b) Herbivores
(c) Producers
(d) Secondary producers
Answer:
(b) Herbivores

Question 26.
is used up in the processes like respiration, combustion, decomposition, corrosion, rusting, etc.
(a) Nitrogen
(b) Oxygen
(c) Argon
(d) Helium
Answer:
(b) Oxygen

Question 27.
Nitrogen forms % of the atmosphere.
(a) 79
(b) 78
(c) 21
(d) 2
Answer:
(b) 78

Question 28.
Most organisms cannot use the free form of
(a) Oxygen
(b) Nitrogen
(c) Carbon dioxide
(d) Carbon monoxide
Answer:
(b) Nitrogen

Question 29.
first proposed the concept of Ecological Pyramid in 1927.
(a) Darwin
(b) Newton
(c) Elton
(d) Edison
Answer:
(c) Elton

Question 30.
Ecological Pyramid is called
(a) Hills
(b) Mounts
(c) Eltonian
(d) Darwinism
Answer:
(c) Eltonian

Question 31.
is produced from oxygen through various atmospheric processes.
(a) Nitrogen dioxide
(b) Nitrites
(c) Ozone
(d) CFC
Answer:
(c) Ozone

Question 32.
Interactions between producers, consumers and saprophytes in a definite sequence is called
(a) Links
(b) Internet
(c) Food chain
(d) Connectors
Answer:
(c) Food chain

Question 33.
Many food chains interconnected at various levels is called
(a) Links
(b) Internet
(c) Connectors
(d) Food web
Answer:
(d) Food web

Question 34.
Decomposers dissipate some amount of energy in the form of
(a) Light
(b) Electricity
(c) Sound
(d) Heat
Answer:
(d) Heat

Question 35.
The flow of nutrients in an ecosystem is
(a) Non- cyclic
(b) Mono directional
(c) Reverse directional
(d) Cyclical
Answer:
(d) Cyclical

Question 36.
The cyclical flow of nutrients within an ecosystem is called
(a) Biological cycle
(b) Chemical cycle
(c) Solar cycle
(d) Bio-geo chemical cycle
Answer:
(d) Bio-geo chemical cycle

Question 37.
is an accumulation of the main abiotic gaseous nutrient materials found in the earth’s atmosphere.
(a) Gaseous cycle
(b) Water cycle
(c) Solar cycle
(d) Lunar cycle
Answer:
(a) Gaseous cycle

Question 38.
Oxygen is released into the atmosphere by the process of
(a) Photosynthesis
(b) Respiration
(c) Oxidation
(d) Decomposition
Answer:
(a) Photosynthesis

Question 39.
Charles Elton studied the of the Beer islands in England..
(a) Tundra ecosystem
(b) Mediterranean ecosystem
(c) Equatorial ecosystem
(d) Taiga ecosystem
Answer:
(a) Tundra ecosystem

Question 40.
in 1942 studied the food chain and energy flow through it.
(a) Charles Elton
(b) Lindeman
(c) Robert Whittaker
(d) Eichler
Answer:
(b) Lindeman

Question 41.
After the death of apex consumers, energy becomes available to
(a) Primary consumer
(b) Secondary consumer
(c) Decomposer
(d) Sun
Answer:
(c) Decomposer

Question 42.
Nitrogen forms % of the atmosphere.
(a) 28%
(b) 78%
(c) 48%
(d) 82%
Answer:
(b) 78%

Question 43.
first proposed the concept of the Ecological Pyramid in 1927.
(a) Charles Elton
(b) Lindeman
(c) Eichler
(d) John Muir
Answer:
(a) Charles Elton

Question 44.
Oxygen is released into the atmosphere by the process of
(a) respiration
(b) Photosynthesis
(c) Combustion
(d) All of these
Answer:
(b) Photosynthesis

Find the odd man out:

Question 1.
Photosynthesis, Respiration, Decomposition, Forest Fires
Answer:
Forest Fires

Question 2.
Combustion, Corrosion, rusting, formation of ozone, Photosynthesis
Answer:
Photosynthesis

Question 3.
Biological nitrogen fixation, ammonification, nitrification, denitrification, industrial nitrogen fixation
Answer:
Industrial nitrogen fixation

Question 4.
Frog, Owl, Squirrel, Fox
Answer:
Squirrel

Question 5.
Grasshopper, squirrel, elephant, lion
Answer:
Lion

Question 6.
Nitrogen cycle, oxygen cycle, carbon cycle, phosphorus cycle
Answer:
Phosphorus cycle

Question 7.
Photosynthesis, Nitrification, Ammonification, Denitrification
Answer:
Photosynthesis

Find out the correlation:

1. Grasshopper : Primary consumer :: Tiger : ………………..
2. Owl : Secondary consumer :: Squirrel : ………………..
3. Flow of energy : One way :: Flow of nutrients : ………………..
4. Plants : Producers :: Bacteria and Fungi : ………………..
5. Nitrogen : Gaseous cycle :: Phosphorus : ………………..
6. Oxygen : 21% :: Nitrogen : ………………..
7. Photosynthesis: Carbon cycle:: Ammonification : ………………..
8. Respiration : Oxygen cycle :: Nitrification : ………………..
9. Respiration : Biotic process :: Combustion : ………………..
10. Microbes using oxygen : Aerobes :: Microbes not using oxygen : ………………..
Answer:
(1) Apex consumer
(2) Primary consumer
(3) Cyclic
(4) Decomposers
(5) Sedimentary cycle
(6) 78%
(7) Nitrogen cycle
(8) Nitrogen cycle
(9) Abioticprocess
(10) Anaerobes

Q.l. (B) 3. Difference between:
(1) Azotobacter and Rhizobium
Answer:

Azotobacter	Rhizobium
Free-living nitrogen-fixing bacteria	Symbiotic nitrogen-fixing bacteria

(2) Biotic components and Abiotic component
Answer:

Biotic components	Abiotic component
Living component of an ecosystem	Physical/Chemical non-living components of an ecosystem

(3) Producers and Herbivores
Answer:

Producers	Herbivores
They are present in the 1st trophic level	They are present in the 2nd trophic level

(4) Carnivores and Herbivores
Answer:

Carnivores	Herbivores
They depend on Herbivores for nutrition	They depend on Producers for nutrition

(5) Phosphorus and Carbon
Answer:

Phosphorus	Carbon
It cycles through the Sedimentary cycle	It cycles through the Gaseous cycle

(6) Food chain and Food web
Answer:

Food chain	Food web
Interactions between producers, consumers and decomposers in a definite sequence is called as a food chain.	The interconnection among different food chains in an ecosystem at various levels is called as a food web

State whether the following statements are true or false. Correct the false statements:

(1) Herbivores occupy the third trophic level in a food chain.
(2) Apex consumers use herbivores and carnivores as their food.
(3) Humans are apex consumers.
(4) Omnivores feed only on carnivores.
(5) A food chain has two links.
(6) The number of consumers in a food web is fixed.
(7) The amount of matter and energy goes on increasing at every level in a food chain.
(8) Robert Brown first proposed the concept of Ecological Pyramid.
(9) After the death of apex consumers, the energy becomes available to decomposers.
(10) The gaseous cycle is a speedier cycle than the sedimentary cycle.
(11) Climatic changes and human activities seriously affect the speed, intensity and equilibrium of bio-geo-chemical cycles.
(12) Carbon dioxide is released in the atmosphere through photosynthesis.
(13) The equilibrium of oxygen and carbon dioxide gases is maintained by decomposers.
(14) The conversion of ammonia into a nitrite and then nitrate is called nitrogen fixation.
(15) Conversion of nitrogen compounds into gaseous nitrogen is called nitrogen fixation.
(16) Release of ammonia through decomposition of dead plants and excretory wastes of organisms is called ammonification.
(17) The cyclic flow of nutrients within an ecosystem is called Energy Pyramid.
Answer:
(1) False, herbivores occupy the second trophic level in a food chain as they are directly dependent on producers.
(2) True
(3) True
(4) False. Omnivores feed on both herbivores and carnivores.
(5) False. A food chain consists of four, five or more links.
(6) False. A food web can have many consumers.
(7) False. The amount of matter and energy goes on decreasing at every level in a food chain.
(8) False. Charles Elton first proposed the concept of Ecological Pyramid.
(9) True
(10) True
(11) True
(12) False. Carbon dioxide is released in the atmosphere through respiration, burning of fossil fuels and wood, forest fires and volcanic activity. (13) False. The equilibrium of oxygen and carbon dioxide gases is maintained by plants.
(14) False. The conversion of ammonia into a nitrite and then nitrate is called nitrification.
(15) False. Conversion of nitrogen compounds into gaseous nitrogen is called denitrification.
(16) True
(17) False. The cyclic flow of nutrients within an ecosystem is called bio-geochemical cycle.

Name the following:

Question 1.
The animals that feed on herbivores.
Answer:
Carnivores.

Question 2.
Organisms that feed on herbivores and carnivores.
Answer:
Omnivores.

Question 3.
Two examples of primary consumers.
Answer:
Grasshopper, squirrel.

Question 4.
Two examples of secondary consumers.
Answer:
Frog, owl.

Question 5.
Two examples of Apex consumers.
Answer:
Lion, tiger.

Question 6.
Levels in the food chain.
Answer:
Trophic level.

Question 7.
Organisms that decompose the dead bodies of plants and animals.
Answer:
Decomposers.

Question 8.
Process which releases oxygen.
Answer:
Photosynthesis.

Question 9.
Release of ammonia through decomposition of dead bodies and excretory wastes of organisms.
Answer:
Ammonification.

Question 10.
Conversion of nitrogen into nitrates and nitrites through atmospheric, industrial and biological processes.
Answer:
Nitrogen fixation.

One line answers:

Question 1.
What is Food chain?
Answer:
Interactions between producers, consumers and decomposers in a definite sequence is called as a food chain.

Question 2.
What is Food web?
Answer:
The interconnection among different food chains in an ecosystem at various levels is called as a food web.

Question 3.
What is Trophic level?
Answer:
A trophic level is the step at which the organism obtains its food in the chain.

Question 4.
What is Pyramid of energy?
Answer:
The pattern of energy exchange in an ecosystem is called a ‘Pyramid of energy’.

Question 5.
What is Bio-geo-chemical cycle?
Answer:
The cyclical flow of nutrients within an ecosystem is called bio-geo-chemical cycle.

Question 6.
What is Carbon cycle?
Answer:
The circulation and recycling of carbon from the atmosphere to living organisms and aher their death back to the atmosphere is called the carbon cycle.

Question 7.
What is Oxygen cycle?
Answer:
The circulation and recycling of oxygen within the biosphere is called as oxygen cycle.

Question 8.
What is Nitrogen cycle?
Answer:
The circulation and recycling of nitrogen gas into the form of different compounds through various biotic and abiotic processes in nature is called the nitrogen cycle.

Question 9.
What is Nitrogen fixation?
Answer:
The process of conversion of free nitrogen gas of the atmosphere into nitrogen compounds is called of nitrogen fixation.

Distinguish between:

Question 1.
Gaseous Cycle and Sedimentary Cycle.
Answer:

Gaseous Cycle	Sedimentary Cycle
(i)      It is an accumulation of the main abiotic gaseous nutrient materials found in the earth’s atmosphere. (ii)    It includes nitrogen, oxygen, carbon dioxide, water vapour etc.	(i)     It is an accumulation of the main abiotic nutrient materials found in the soil, sediment and sedimentary rocks, etc. of the earth. (ii)    It includes soil components like iron, calcium, phosphorus etc.

Question 2.
Carbon Cycle and Nitrogen Cyde.
Answer:

Carbon Cycle	Nitrogen Cycle
(i) The circulation and recycling of carbon from the atmosphere to living organisms and after their death back to the atmosphere is called the carbon cycle.	(i) The circulation and recycling of nitrogen into the form of different compounds through various biotic and abiotic processes in nature is called the nitrogen cycle.
(ii) Main processes involved in the carbon cycle are photosynthesis and respiration.	(ii) Main processes involved in the nitrogen cycle are nitrogen fixation, ammonification, nitrification and denitrification.
(iii) Carbon in the form of carbon dioxide is directly absorbed by plants for photosynthesis.	(iii) Nitrogen gas cannot be directly absorbed by plants. So nitrogen is fixed by the process of nitrogen fixation and then absorbed from the soil.

Complete the flow chart:

Question 1.
Energy Pyramid.

Question 3.
Nitrogen Cycle

Question 4.
Bio-Geo Chemical cycle

Write short notes on:

Question 1.
Trophic level.
Answer:

• Each level in the food chain is called a trophic level.
• A trophic level is the step at which the organism obtains its food in the chain.
• The amount of matter and energy gradually decreases from producers at the lowest level to the top consumers at the highest level.

Question 2.
Food web.
Answer:

• An ecosystem consists of many food chains that are interconnected at various levels. This is called food web.
• An organism may be the prey for many other organisms.
• For example, an insect feeds upon leaves of various plants but the same insect is the prey for different animals like wall lizards, birds etc.
• This forms an intricate web instead of a linear food chain. Such an intricate network is called as food web.
• Generally food webs are formed everywhere in nature.

Question 3.
Energy Pyramid.

Answer:

• Each level in the food chain is called a trophic level.
• The amount of matter and energy gradually decreases from producers at the lowest level to the top consumers at the highest level.
• The initial quantity of energy goes on decreasing at every level of energy exchange.
• Similarly, the number of organisms also decreases from the lowest level to the highest level.
• This pattern of energy exchange in an ecosystem is called a Pyramid of energy.

Explain the following statements

Question 1.
justify the statements
(a) Producers form the first trophic level in the food chain. Herbivores depend directly on producers.
(b) The flow of nutrients in an ecosystem is cyclic.
(c) Plants in an ecosystem are called autotrophs.
Answer:

1. So herbivores form the second trophic level, whereas carnivores depend on herbivores, so they form the third trophic level in the food chain.
2. The nutrients are circulated and recycled from the biosphere to living organisms and after their death back to the biosphere.
3. They produce their own food by the process of photosynthesis. All animals in an ecosystem directly or indirectly depend on plants for food.

Explain the diagram

Question 1.
Food chain in a forest ecosystem:

Answer:

• In a forest ecosystem, grass is eaten by a deer, which in turn is eaten by a tiger.
• The grass, deer and tiger form a food chain.
• In this food chain, energy flows from the grass (producer) to the deer (primary consumer) to the tiger (secondary consumer).

Question 2.
Food chain in an aquatic ecosystem (Pond)

Answer:

• In a aquatic ecosystem algae are eaten by insects.
• Insects are eaten by small fish, small fish are in turn eaten by big fish.
• And the big fish are eaten by fish eating birds.
• In this food chain, energy flows from the algae (producer) to the insects (primary consumers) to the small fish (secondary consumers) to the big fish (tertiary consumer) and to the fish eating birds (apex consumer).

Question 3.
Carbon cycle

Answer:

• The circulation and recycling of carbon from the atmosphere to living organisms and after their death back to the atmosphere is called carbon cycle.
• Main processes involved in carbon cycle are photosynthesis and respiration.
• Carbon in the form of carbon dioxide is directly absorbed by plants for photosynthesis

Question 4.
Nitrogen cycle

Answer:
(i) The circulation and recycling of nitrogen into the form of different compounds through various biotic and abiotic processes in nature is called the nitrogen cycle.
(ii) Main processes involved in nitrogen cycle are nitrogen fixation, ammonification, nitrification and denitrification.
(iii) Nitrogen gas cannot be directly absorbed by plants. So nitrogen is fixed by the process of nitrogen fixation and then absorbed from the soil.

Question 5.
Oxygen cycle

Answer:

1. Oxygen forms 21% of the atmosphere. It is also present in the hydrosphere and lithosphere.
2. Circulation and recycling of oxygen within the biosphere is called the oxygen cycle.
3. This cycle, includes both the biotic and abiotic components.
4. Oxygen is continuously produced as well as used up in the atmosphere.
5. Oxygen is highly reactive and it readily reacts with other elements and compounds.
6. As oxygen is found in various forms like molecular oxygen (O₂), water (H₂O), carbon dioxide (CO₂), inorganic compounds etc, the oxygen cycle of the biosphere is extremely complex.
7. Oxygen is released in the process of photosynthesis, whereas it is used up in processes like respiration, combustion, decomposition, corrosion, rusting, etc.

Answers based on figures.

Question 1.
Nitrogen Cycle

Answer:

• Oxygen forms 21% of the atmosphere. It is also present in the hydrosphere and lithosphere.
• The circulation and recycling of oxygen within the biosphere is called the oxygen cycle.
• This cycle, includes both the biotic and abiotic components.
• Oxygen is continuously produced as well as used up in the atmosphere.
• Oxygen is highly reactive and it readily reacts with other elements and compounds.
• As oxygen is found in various forms like molecular oxygen (O₂), water (H₂O), carbon dioxide (CO₂), inorganic compounds etc, the oxygen cycle of the biosphere is extremely complex.
• Oxygen is released in the process of photosynthesis, whereas it is used up in processes like respiration, combustion, decomposition, corrosion, rusting, etc.

Answers based on figures.

Question 1.
Nitrogen Cycle

(i) Is nitrogen a reactive gas?
Answer:
Nitrogen in its atmospheric state non-reactive gas

(ii) Name process of nitrogen conversion from atmosphere to green plants.
Answer:
Nitrogen fixation is the process of nitrogen conversion atmosphere to green plants

(iii) Name the process of converting usable nitrogenous products into atmospheric inert nitrogen.
Answer:
Denitrification is the process of converting usable nitrogenous products into atmospheric inert nitrogen

(iv) Animals produce which product of nitrogen?
Answer:
Animals produce ammonia as a product of nitrogen

(v) Name two nitrifying organisms.
Answer:
Azotobacter and Rhizobium are the two nitrifying organisms

(vi) Which type of bio-geo-chemical cycles does nitrogen follow?
Answer:
Nitrogen follows gaseous and sedimentary bio-geo-chemical cycles

Question 2.
Carbon cycle

(i) Is carbon dioxide gas freely available in the atmosphere?
Answer:
Carbon dioxide gas is freely available in the atmosphere

(ii) How is carbon found in water?
Answer:
Carbon is found in water in the form of carbonates

(iii) How are we using carbon as a fuel?
Answer:
Fossil fuels are a form of carbon which are used as fuel by us

(iv) How to plants use carbon as their food source?
Answer:
Plants take up carbon in photosynthesis and convert it into starch which is their food source

(v) How do animals use carbon?
Answer:
Animals use carbon in form of organic compounds and inorganic compounds

(vi) Which type of bio-geo-chemical cycles does carbon follow?
Answer:
Carbon follows gaseous and sedimentary bio-geo-chemical cycles

Question 3.
Oxygen cycle

(i) Is oxygen gas freely available in the atmosphere?
Answer:
Oxygen gas is freely available in the atmosphere

(ii) How is oxygen used by animals?
Answer:
Oxygen is used in respiration by the animals

(iii) How are we using carbon as a fuel?
Answer:
Fossil fuels are a form of carbon which are used as fuel by us

(iv) How to plants use carbon as their food source?
Answer:
Plants take up carbon in photosynthesis and convert it into starch which is their food source

(v) How do animals use carbon?
Answer:
Animals use carbon in form of organic compounds and inorganic compounds

(vi) Which type of bio-geo-chemical cycles does carbon follow?
Answer:
Carbon follows gaseous and sedimentary biogeo-chemical cycles

Question 4.
Food web

(i) What is the basic unit of food web?
Answer:
The basic unit of food web is food chain

(ii) Which organisms are on the 1st level of this food web?
Answer:
Producers are p. the 1st level of this food web

(iii) What are the animals which depend on producers directly for nutrition called?
Answer:
The animals which depend on producers directly for nutrition are called Herbivores

(iv) What are the animals which eat any type of food for nutrition called?
Answer:
The animals which eat any type of food for nutrition are called Omnivore

(v) What will happen if one animal in the food chain goes extinct?
Answer:
If one animal in the food chain goes extinct the entire food chain collapse

(vi) What are the factors badly affecting the food web?
Answer:
Factors like hunting, pollution, deforestation, human-animal conflicts etc. are the factors badly affecting the food web

Complete the paragraph

(1) Elemental oxygen is normally found in the form of a diatomic molecule. However, in the upper reaches of the atmosphere, a molecule containing three atoms of oxygen is found. This would mean a formula of 03 and this is called ozone. Unlike the normal diatomic molecule of oxygen, ozone is poisonous and we are lucky that it is not stable nearer to the Earth’s surface. But it performs an essential function where it is found. It absorbs harmful radiations from the Sun. This prevents those harmful radiations from reaching the surface of the Earth where they may damage many forms of life.

Recently it was discovered that this ozone layer was getting depleted. Various man-made compounds like CFCs (carbon compounds having both fluorine and chlorine) which are very stable and not degraded by any biological process) were found to persist in the atmosphere. Once they reached the ozone layer, they would react with the ozone molecules. This resulted in a reduction of the ozone layer and recently they have discovered a hole in the ozone layer above the Antarctica. It is difficult to imagine the consequences for life on Earth if the ozone layer dwindles further, but many people think that it would be better not to take chances. These people advocate working towards stopping all further damage to the ozone layer.

(2) The utilisation of glucose to provide energy to living things involves the process of respiration in which oxygen may or may not be used to convert glucose back into carbon dioxide. This carbon dioxide then goes back into the atmosphere. Another process that adds to the carbon dioxide in the atmosphere is the process of combustion where fuels are burnt to provide energy for various needs like heating, cooking, transportation and industrial processes.

In fact, the percentage of carbon dioxide in the atmosphere is said to have doubled since the industrial revolution when human beings started burning fossil fuels on a very large scale. Carbon, like water, is thus cycled repeatedly through different forms by the various physical and biological activities. Heat is trapped by glass, and hence the temperature inside a glass enclosure will be much higher than the surroundings. This phenomenon was used to create an enclosure where tropical plants could be kept warm during the winters in colder climates. Such enclosures are called greenhouses.

Greenhouses have also lent their name to an atmospheric phenomenon. Some gases prevent the escape of heat from the Earth. An increase in the percentage of such gases in the atmosphere would cause the average temperatures to increase worldwide and this is called the greenhouse effect. Carbon dioxide is one of the greenhouse gases. An increase in the carbon dioxide content in the atmosphere would cause more heat to be retained by the atmosphere and lead to global warming.

(3) Nitrogen gas makes up 78% of our atmosphere and nitrogen is also a part of many molecules essential to life like proteins, nucleic acids (DNA and RNA) and some vitamins. Nitrogen is found in other biologically important compounds such as alkaloids and urea too. Nitrogen is thus an essential nutrient for all life-forms and life would be simple if all these life-forms could use the atmospheric nitrogen directly. However, other than a few forms of bacteria, life-forms are not able to convert the comparatively inert nitrogen molecule into forms like nitrates and nitrites which can be taken up and used to make the required molecules.

These nitrogen-fixing bacteria may be free-living or be associated with some species of dicot plants. Most commonly, the nitrogenfixing bacteria are found in the roots of legumes (generally the plants which give us pulses) in special structures called root nodules. Other than these bacteria, the only other manner in which the nitrogen molecule is converted to nitrates and nitrites is by a physical process. During lightning, the high temperatures and pressures created in the air convert nitrogen into oxides of nitrogen. These oxides dissolve in water to give nitric and nitrous acids and fall on land along with rain. These are then utilised by various lifeforms.

Read the paragraph and answer the questions:

(1) Nitrogen cycle
The nitrogen cycle is the biogeochemical cycle by which nitrogen is converted into multiple chemical forms as it circulates among the atmosphere, terrestrial, and marine ecosystems. The conversion of nitrogen can be carried out through both biological and physical processes. Important processes in the nitrogen cycle include fixation, ammonification, nitrification, and denitrification, The majority of Earth’s atmosphere (78%) is atmosphere nitrogen, making it the largest source of nitrogen.

However, atmospheric nitrogen has limited availability for biological use, leading to a scarcity of usable nitrogen in many types of ecosystems. The nitrogen cycle is of particular interest to ecologists because nitrogen availability can affect the rate of key ecosystem processes, including primary production and decomposition, Human activities such as fossil fuel combustion, use of artificial nitrogen fertilizers, and release of nitrogen in wastewater have dramatically altered the global nitrogen cycle. Human modification of the global nitrogen cycle can negatively affect the natural environment system and also human health.

(i) Why nitrogen cycle is called bio-geochemical cycle?
Answer:
Nitrogen cycle is called bio-geochemical cycle as it undergoes biological as well as geochemical processes.

(ii) Why is nitrogen cycle important to us?
Answer:
Nitrogen cycle is important to us as nitrogen availability can affect the rate of key ecosystem processes, including primary production and decomposition.

(iii) Name important process of nitrogen cycle.
Answer:
Important processes in the nitrogen cycle include fixation, ammonification, nitrification, and denitrification.

(iv) What can affect the nitrogen cycle negatively?
Answer:
Human modification of the global nitrogen cycle can negatively affect the natural environment system and also human health.

(v) Which human activities change the nitrogen cycle?
Answer:
Human activities such as fossil fuel combustion, use of artificial nitrogen fertilizers, and release of nitrogen in wastewater have dramatically altered the global nitrogen cycle.

(2) Food web
A food chain is a linear network of links in a food i web starting from producer organisms (such asgrass or trees which use radiation from the Sun to make their food) and ending at apex predator species (like grizzly bears or killer whales), detritivores (like earthworms or woodlice), ordecomposer species (such as fungi or bacteria), A food chain also shows how the organisms are related with each other by the food they eat. Each level of a food chain represents a different trophiclevel. A food chain differs from a food web, because the complex network of different animal’s feeding relations are aggregated and the chain only follows a direct, linear pathway of one animal at a time.

Natural interconnections between food chains make it a food web. A common metric usedto the quantify food web trophic structure is foodi chain length. In its simplest form, the length of a chain is the number of links between a trophici consumer and the base of the web and the meanchain length of an entire web is the arithmetic average of the lengths of all chains in a food web. The food chain is an energy source diagram. Many food webs have a keystone species. A keystonespecies is a species that has a large impact on thei surrounding environment and can directly affectthe food chain.

If this keystone species dies off it can set the entire food chain off balance. Keystonespecies keep herbivores from depleting all of thei foliage in their environment and preventing ai mass extinction. Food chains were first introduced by the Arab scientist and philosopher Al-Jahiz inthe 10th century and later popularized in a book I published in 1927 by Charles Elton, which also i introduced the food web concept.

(i) What is a food web?
Answer:
Food web is a linear network of links of food chains.

(ii) In a food web which organism are called producers?
Answer:
In a food web which organism which can produce food by photosynthesis are called producers.

(iii) What is the role of keystone species?
Answer:
Keystone species keep herbivores from depleting all of the foliage in their environment and preventing a mass extinction.

(iv) What is a keystone species?
Answer:
A keystone species is a species that has a large impact on the surrounding environment and can directly affect the food chain.

(v) What does each level of food chain represent?
Answer:
Each level of a food chain represents a different trophic level.

(3) Carbon cycle
The carbon cycle is the biogeochemical cycle by which carbon is exchanged among the biosphere, pedosphere, geosphere, hydrosphere, and atmosphere of the Earth. Carbon is the main component of biological compounds as well as a major component of many minerals such as limestone. Along with the nitrogen cycle and the water cycle, the carbon cycle comprises a sequence of events that are key to make Earth capable of sustaining life. It describes the movement of carbon as it is recycled and reused throughout the biosphere, as well as long-term processes of carbon sequestration to and release from carbon sinks.

The carbon cycle was discovered by Antoine! Lavoisier and Joseph Priestley, and popularised by Humphry Davy. Carbon in the Earth’satmosphere exists in two main forms carbon dioxide and methane. Both of these gases absorb and retain heat in the atmosphere and are partially responsible for the greenhouse effect. Methane produces a larger greenhouse effect per volume as compared to carbon dioxide, but it exists in much lower concentrations and is more short-lived than carbon dioxide, making carbon dioxide the more important greenhouse gas of the two.

Carbon dioxide is removed from the atmosphere primarily through photosynthesis and enters the terrestrial and oceanic biospheres. Carbon dioxide also dissolves directly from the atmosphere into bodies of water (ocean, lakes, etc.), as well as dissolving in precipitation as raindrops fall through the atmosphere. When dissolved in water, carbon dioxide reacts with water molecules and forms carbonic acid, which contributes to ocean acidity. It can then be absorbed by rocks through weathering. It also can acidify other surfaces it touches or be washed into the ocean.

(i) Which gas has greener house effect as compared to CO₂?
Answer:
Methane gas CH₄ has greener house effect as compared to CO₂.

(ii) How does dissolved CO₂ affect oceans?
Answer:
When dissolved in water, carbon dioxide reacts with water molecules and forms carbonic acid, which contributes to ocean acidity.

(iii) Why is carbon cycle called bio-geochemical cycle?
Answer:
The carbon cycle is the biogeochemical cycle by which carbon is exchanged among the biosphere, pedosphere, geosphere, hydrosphere, and atmosphere of the Earth.

(iv) How is carbon dioxide removed from atmosphere?
Answer:
Carbon dioxide is removed from the atmosphere primarily through photosynthesis and enters the terrestrial and oceanic biospheres.

(v) Who discovered the carbon cycle?
Answer:
The carbon cycle was discovered by Antoine Lavoisier and Joseph Priestley.

Answer the questions in detail:

Question 1.
Write the important processes of the nitrogen cycle.
Answer:

• Nitrogen fixation: Conversion of nitrogen into nitrates and nitrites through atmospheric, industrial and biological processes.
• Ammonification: Release of ammonia through decomposition of dead bodies and excretory wastes of organisms.
• Nitrification: Conversion of ammonia into a nitrite and then nitrate.
• Denitrification: Conversion of nitrogen components into gaseous nitrogen.

Make a concept diagram and explain.

Question 1.
Food chain

Answer:
According to the mode of nutrition the organisms are classified into producers, consumers, saprotrophs (saprophytes) and decomposers. Primary consumers are directly dependent on autotrophs (producers), e.g.: Grasshopper, squirrel, elephant) Secondary consumers use herbivores as their food, e.g.: Frog, owl, fox, etc. Apex or top consumers use herbivores and carnivores as their food. No animals feed on top consumers, e.g.: Tiger, lion, etc. Omnivores feed on herbivores and carnivores, e.g.: Humans, bear, etc. A continuous interaction between producers, consumers and decomposers in a definite sequence is called as food chain.

Food chain, in ecology is the sequence of transfers of matter and energy in the form of food from organism to organism. Food chains intertwine locally into a food web because most organisms consume more than one type of animal or plant. Plants, which convert solar energy to food by photosynthesis, are the primary food source. In a predator chain, a plant-eating animal is eaten by a flesh-eating animal. In a parasite chain, a smaller organism consumes part of a larger host and may itself be parasitized by even smaller organisms. In a saprophytic chain, microorganisms live on dead organic matter.

Question 2.
Energy pyramid
Answer:

An energy pyramid is a model that shows the flow of energy from one trophic, or feeding, level to the next in an ecosystem. The model is a diagram that compares the energy used by organisms at each trophic level. The energy in an energy pyramid is measured in units of kilocalories (kcal). Energy pyramids are similar to biomass pyramids, another type of trophic pyramid that models the amount of biomass at each trophic level in an ecosystem, energy flow in ecosystems. The structure of an energy pyramid reflects the trophic structure of an ecosystem.

The pyramid is divided into trophic levels similar to those in a food chain. At the pyramid base are the producers, autotrophic organisms that make their own food from inorganic substances. All of the other organisms in the energy pyramid are consumers. These are heterotrophs, meaning that they get food energy by consuming other organisms. The consumers at each trophic level feed on organisms from the level below and are themselves consumed by organisms at the level above. Primary consumers are organisms that consume producers; thus, most primary consumers are herbivores, though some may be detrivores (organisms that feed on decaying organic matter).

Secondary consumers are carnivores that feed on primary consumers and tertiary consumers are carnivores that eat secondary consumers. In rare instances, an ecosystem may have an additional trophic level composed of quaternary consumers camivores that consume tertiary consumers’ energy pyramid. The shape of an energy pyramid shows that the amount of food energy that enters each trophic level is less than the amount that entered the level below. Approximately 90 percent of the food energy that enters a trophic level is “lost” as heat when it is used by organisms to power the normal activities of life such as breathing and digesting food the remaining 10 percent is stored in the various organisms’ tissues.

It is this latter energy that is available to be passed to the next trophic level. Thus, the higher the trophic level on the pyramid, the lower the amounts of available energy ecosystem energy transfer through an ecosystem. The number of organisms at each level decreases relative to the level below because there is less energy available to support those organisms. The top level of an energy pyramid has the fewest organisms because it has the least amount of energy. Eventually there is not enough energy left to support another trophic level; thus most ecosystems only have four trophic levels.