Class 6

Balbharti Maharashtra State Board Class 6 Science Solutions Chapter 4 Disaster Management Notes, Textbook Exercise Important Questions and Answers.

Std 6 Science Chapter 4 Disaster Management Question Answer Maharashtra Board

Class 6 Science Chapter 4 Disaster Management Question Answer Maharashtra Board

1. What are the emergency contact numbers of the following:

Question a.
Police Control Room
Answer:
100

Question b.
Fire brigade
Answer:
101

Question c.
Ambulance
Answer:
102

Question d.
National level single emergency number for disaster relief
Answer:
108

2. What first aid will you provide in the following situations?
a. Dog bite
b. Scratches/Bleeding
c. Bums/Scalds
d. Snakebite
e. Sunstroke

Question a.
Dog bite
Answer:
First aid is some immediate aid given to a victim or patient before medical treatment is available.

1. Wash the wound with a soap solution.
2. Cover the wound with a clean and dry cloth.
3. Get a doctor’s help.

Question b.
Scratches / Bleeding
Answer:

1. Make the person sit or lie down comfortably.
2. Clean the bleeding part of the bodywith water.
3. Keep it above the level of the heart.

Question c.
Bums/scalds
Answer:

a. Minor bums

1. The injured part should be washed with water or held underwater.
2. Give the victim water to drink.
3. Clean the wounds using a cotton swab soaked in an antiseptic solution.
4. Do not apply oily ointments.
5. Cover the wound using dry dressings.

b. Serious bums

1. Give emotional support.
2. Cover the wound with sterilised cloth.
3. Remove jewellery, shoes etc. if easily possible.
4. Do not touch or burst the blisters on the skin.
5. Do not apply oily ointments.
6. Do not try to remove the cloth if it is struck to the burnt skin.
7. If the patient is conscious give water to drink but avoid tea or coffee or other stimulating drinks. Get medical aid at once.

Question d.
Snakebite
Answer:

1. Wash the wound with water.
2. Give emotional support to the patient.
3. Tie a cloth tightly above the wound.
4. Get immediate medical help.

Question e.
Sunstroke
Answer:

1. Take the patient to a cool place or in the shade.
2. Sponge the whole body with cold water.
3. Place a cloth soaked in cold water on the neck.
4. Give plenty of water or liquids like sherbets to drink.
5. If the patient feels like vomiting make him prone i.e. on his/her abdomen with the head turned to one side.
6. Get medical help or shift the patient to a hospital.

3. Write the causes of the following:
a. Floods
b. Forest fires
c. Landslides/building collapse
d. Storms
e. Earthquakes

Question a.
Floods:
Answer:

1. 1. Floods is a frequently occurring natural disaster in all parts of the world.
   2. Due to excessive rains in the same place, a river overflows its banks causing a flood.
   3. The water drainage system in big cities falls short when there is heavy rainfall, resulting in choking of gutters and drainage lines.
   4. Water overflows on to the roads and surrounding houses.

Question b.
Forest fires:

1. Forest fire is an uncontrolled fire in a forest, pasture or grasslands due to natural or man-made causes.
2. Natural causes of forest fire can be lightning, volcanic eruptions, friction amongst branches of trees in extremely hot and dry weather.
3. Man-made causes of forest fires are clearing land by burning which sometimes goes out of control.
4. Campers and hikers sometimes leave behind a potential source of ignition like a lighted cigarette or a campfire.

Question c.
Landslides/building collapse:
Answer:

1. Landslide causes due to erosion, slope movement in the downward direction, prolonged rainfall and seepage, vibration caused by earthquakes, deforestation, river erosion.
2. Building collapses: Bad design, faulty construction, foundation failure or weak foundation, extraordinary loads, earthquakes, rampant and irregular constructions.

Question d.
Storms:
Answer:
The formation of high and low air pressure belts in the atmosphere causes changes in weather resulting in strong winds or storms.

Question e.
Earthquakes:
Answer:

1. Movements in the interior of the earth release tremendous amount of energy.
2. This causes seismic waves leading to movement of the earth’s surface like tremors, shaking, cracking up.
3. Such vibrations or quaking in the earth’s crust is known as earthquake.
4. Man-made causes like mining, construction of big dams can also lead to earthquakes.

4. Answer the following questions.

Question a.
What is meant by ‘disaster’?
Answer:
A sudden event that causes large-scale damage to life, property and social aspects of a nation or society is called a disaster.

Question b.
What are the types of disasters?
Answer:
Disasters are of two types: Natural disasters and man-made disasters.

Question c.
What is meant by disaster management’?
Answer:
Taking steps to prevent disasters, making plans to face disasters and developing the capacity for that is called disaster management.

Question d.
Which are the main components of disaster management?
Answer:
Emergency planning and implementation of disaster management work are the main components of disaster management. Community participation is close, related to disaster management.

5. Find out about the work of a ‘Sarpa-mitra’.

Question a.
Find out about the work of a ‘Sarpa-mitra’.
Answer:

1. A sarpa-mitra is a friend of snakes, a person who is trained to protect, save and safeguard snakes.
2. Whenever there is a phone call from police or citizens informing the sarpa-mitras about snake sightings, they immediately rush to the situation and rescue the snake that would have been killed at the hands of people.
3. Sarpa-mitra are well trained to handle snakes by capturing them, keeping them in baskets or bags before releasing them in the wild.
4. They are in contact with the Police Department and Forest Department for rehabilitation of snakes.
5. Sarpa-mitra are also trained to perform primary first aid to snake bite victims before they are moved to hospitals.
6. Thus, the sarpa-mitra do a commendable job of saving snakes, saving human life without any monetary gains, but for sheer love of snakes.

6. Find out what a first aid kit / box contains.

Question a.
Find out what a first aid kit / box contains.
Answer:
1. First aid kit/box is a necessity at home, workplace, travelling, schools, etc.
2. It contains a cotton roll, sterilized dressing, a pair of scissors, Dettol or Savlon, Dettol soap, adhesive plaster, tablets like Crocin, necessary medicines – painkiller, Tincture iodine, Electrolyte powder, ear/eye drops, Potassium Permanganate crystals, Bumol ointment for cramps.

7. Suggest remedial measures for dealing with natural or man-made disasters.

Question a.
Suggest remedial measures for dealing with natural or man-made disasters.
Answer:

1. Fire: Use a fire extinguisher. Call the fire brigade. Run to a safe exit.
2. Building collapse: Evacuate the building immediately, seek shelter in other safe places. Call the fire brigade or rescue team. First aid should be given to injured people.
3. Road accident: Call the ambulance immediately. Give first aid if possible.
4. Flood: Do not linger in houses or areas near river banks. Seek shelter in other safe places. Move to safer places at a greater height. Do not step into water currents or drive a vehicle into them.
5. War: Take shelter in relief camps. Provide assistance in the rescue mission.
6. Bomb explosions: Take shelter in relief camps/safe place. Immediately call the police. Be alert and do not touch the unattended objects.
7. Earthquakes: Run to a safe place. Hide below a table.and do not use elevators. Use a staircase.
8. Deluge: Take the warnings and signals from the Meteorological Department keep away from river banks and low-lying areas. Take shelter in relief camps.
9. Storm: Remain in a safe place. Unplug all electrical devices. Take instructions given to people by meteorological department do not take shelter in dilapilated structures and under trees.
10. Tsunami: Move to a safer place, stay alert.
11. Drought: Save water, take care of people and cattle.
12. Landslide: Landslide may be caused due to excessive rains or cloudbusrt in hilly areas. Do not take shelter at the foot of a hill.

Activity:

Question 1.
Compile information about measures taken for disaster management in your school.

Question 2.
Make posters, advertisements, banners about disaster management.

Question 3.
Find out the people/organisations that provide aid during a disaster. Obtain their phone numbers, addresses, etc.

Class 6 Science Chapter 4 Disaster Management Important Questions and Answers

Fill in the blanks:

Question 1.
In 1993, many people died due to the earthquake at ……………… in Latur district.
Answer:
Killari

Question 2.
Even today, people of shudder at the memory of ……………… 26 July, 2005.
Answer:
Mumbai

Question 3.
In November 2015, many people died due to flooding caused by heavy rains in ……………… .
Answer:
Tamil Nadu

Question 4.
Movements in the interior of the earth release tremendous amounts of ……………… .
Answer:
energy

Question 5.
Vibrations or ……………… in the earth’s crust is known as earthquake.
Answer:
quaking

Question 6.
Man-made causes like ……………… and construction of big dams can also lead to earthquakes.
Answer:
mining

Question 7.
A frequently occurring natural disaster in all parts of the world is ………………. .
Answer:
floods

Question 8.
Forest fires spread at a ……………… speed.
Answer:
tremendous

Question 9.
Landslides occur in hilly areas due to a ……………… .
Answer:
cloudburst

Question 10.
To get protection from fire, use ……………… .
Answer:
fire extinguisher

Match the following. 

Question 1.

Column ‘A’	Column ‘B’
1. July 2005	a. Floods in Tamil Nadu
2. July 2014	b. Floods in Mumbai
3. November 2015	c. Earthquake in Latur
4. 1993	d. Landslide in Pune

Answer:

Column ‘A’	Column ‘B’
1. July 2005	b. Floods in Mumbai
2. July 2014	d. Landslide in Pune
3. November 2015	a. Floods in Tamil Nadu
4. 1993	c. Earthquake in Latur

State whether the following statements are True or False. If false, correct them.

Disaster Management Class 6  Question 1.
In 1993, many people died due to the earthquake at Malin in Pune district.
Answer:
False: In 1993 many people died due to the earthquake at Killari in Latur district.

Disaster Management Class 6 Exercise Question 2.
Disaster Management Class 6 ExerciseEven today, people of Mumbai shudder at the memory of July 2007.
Answer:
False: Even today people of Mumbai shudder at the memory of July 2005.

Class 6 Science Chapter 4 Disaster Management  Question 3.
Increased risk due to high density of population in a limited area can cause disaster.
Answer:
True

4 Disaster Management Exercise Question 4.
Earthquakes cause huge loss of life and property.
Answer:
True

Question 5.
Forest fire is a controlled fire in a forest, pasture or grassland.
Answer:
False: Forest fire is an uncontrolled fire in a forest, pasture or grassland.

Question 6.
Storms cause no disruption of electric supply.
Answer:
False: Storms cause disruption of electric supply.

Question 7.
Community participation is closely related to disaster management.
Answer:
True

Question 8.
National Disaster Management Authority was established in 2008.
Answer:
False: National Disaster Management Authority was established in 2005.

Question 9.
During a disaster, keep watching movies on TV.
Answer:
False: During a disaster keep watching news bulletin on TV.

Question 10.
In case of a disaster, use the website www. imd.gov.in
Answer:
True

Answer the following in one sentence:

Question 1.
What are man-made causes of earthquakes?
Answer:
Mining, construction of big dams can lead to earthquakes.

Question 2.
What are forest fires?
Answer:
A forest fire is an uncontrolled fire in a forest, pasture or grassland due to natural or man-made causes.

Question 3.
State the website to seek government’s help during disaster.
Answer:
To seek government’s help during a disaster we can log on to xvww.imd.gov.in

Question 4.
Where should we take shelter during floods?
Answer:
We should seek shelter in safe places especially safer places at great heights.

Question 5.
What is sunstroke?
Answer:
When we work in the sun continuously for a long time, the body loses a lot of water and minerals. Hence, the person experiences sunstroke.

Question 6.
Name some poisonous snakes.
Answer:
Some poisonous snakes are cobras, kraits, vipers and sea snakes.

Question 7.
What should we do when we come across a snake?
Answer:
When we come across a snake we should contact a sarpa-mitra.

Question 8.
What is first aid?
Answer:
Immediate aid given even before medical treatment is available on facing a disaster or accident is first aid.

Answer the following questions briefly:

Question 1.
What are the effects of an earthquake?
Answer:
The effects of an earthquake are:

1. Destruction of infrastructure i.e buildings, bridges, roads, railway tracks.
2. Change in the direction of the flow of river.
3. Huge loss of life and property.

Question 2.
What are the effects of floods on people?
Answer:

1. There is a huge loss of life and property.
2. Soil erosion
3. Destruction of standing crops.
4. After-effects of floods, like spread of diseases and epidemics affecting the health of the people.

Question 3.
What are the effects of storms?
Answer:

1. Great damage in the storm affected region.
2. Tremendous losses to life and property.
3. Disruption of electric supply.
4. Disruption of transport and communication.

Question 4.
What are the effects of forest fires?
Answer:

1. Great damage to natural wealth and bio-diversity.
2. Pollution of air.

Question 5.
What preventive measures should we take to protect us from fire?
Answer:
To get protection from fire, use fire extinguishers in public places like schools, hospitals, railway stations.

Question 6.
What first aid can be provided to a person if he is bleeding?
Answer:
If a person is bleeding, first make him sit or lie down comfortably. Clean the bleeding part of the body with water and keep it above the level of the heart.

Give scientific reasons:

Question 1.
Why should a dog bite victim get an injection of the anti-rabies vaccine?
Answer:
In a dog bite, there is a risk of infection of rabies through the blood, hence anti-rabies injection is given to the patient.

Question 2.
During a disaster if possible we should take shelter in relief camps.
Answer:
Relief camps provide medicines, food packets, drinking water and first aid. Since these things help victims to restart, people should take shelter in relief camps during a disaster.

Question 3.
During disaster use battery operated radios and mobile.
Answer:
During disaster, many times there is disruption of electricity, hence battery operated mobiles and radios are convenient.

Can you tell?

Question 1.
What event do you see in these pictures?
Answer:
In this picture we see –
(a) earthquakes
(b) drought
(c) flood
(d) fire
(e) storm
(f) volcanic eruptions.

Question 2.
What would you have done in these situations?
Answer:
In these situations I would have tried to save my life. (Answer:wers may vary)

Question 3.
Have you experienced such a situation yourself?
Answer:
No. (Answer:wers may vary)

Question 4.
Why do these events occur?
Answer:
This events are disasters and some occur naturally and some are man-made.

Question 5.
According to you, what can be done to deal with such a disaster?
Answer:
To deal with such a disaster, take help of some elders or ask for help immediately. Be alert and use first-aid / get some immediate aid even before medical treatment becomes available.

Use your brainpower!

Question 1.
What disaster can occur in school or on the way to school?
Answer:
1. Disasters that can occur in school: Fire in the school building, experience tremors of earthquake, school building collapses, slab in one of the classroom collapses, getting injured while playing, getting an electric shock.
2. Disasters that can occur on way to school: You meet with an accident while crossing the road or school bus meets with an accident. Area near school gets flooded.

Classify the following disasters as man-made or natural.
(fire, earthquake, leakage of chemical gases, storms, floods, tsunami, bomb explosions, collapse of a building, war, forest fire)
Answer:

Man-made disasters	Natural disasters
1. Fire	1. Earthquake
2. Leakage of chemical gases	2. Storms
3. Bomb explosion	3. Floods
4. Collapse of a building	4. Tsunami
5. War	5. Forest fire
6. Forest- fire

Can you tell?

Question 1.
How many children are there in your class at present?
Answer:
There are 50 children in my class at present. (Answers may vary)

Question 2.
What would happen if five times this number sat in your class?
Answer:
If five times this number sat in my class, the classroom would be crowded. There will be utter chaos.

Question 3.
Which kind of disaster can occur in an extremely crowded places?
Answer:
In an extremely crowded place there can be panic in the classroom, stampede while going out of the classroom, breathless among fellow students.

6th Std Science Questions And Answers:

• Natural Resources – Air, Water and Land Class 6 Questions And Answers
• The Living World  Class 6 Questions And Answers
• Diversity in Living Things and their Classification Class 6 Questions And Answers
• Disaster Management Class 6 Questions And Answers
• Substances in the Surroundings – Their States and Properties Class 6 Questions And Answers
• Substances in Daily Use Class 6 Questions And Answers
• Nutrition and Diet Class 6 Questions And Answers
• Our Skeletal System and the Skin Class 6 Questions And Answers
• Motion and Types of Motion
• Force and Types of Force Class 6 Questions And Answers

Balbharti Maharashtra State Board Class 6 Science Solutions Chapter 8 Our Skeletal System and the Skin Notes, Textbook Exercise Important Questions and Answers.

Std 6 Science Chapter 8 Our Skeletal System and the Skin Question Answer Maharashtra Board

Class 6 Science Chapter 8 Our Skeletal System and the Skin Question Answer Maharashtra Board

1. Fill in the blanks with the proper word. 

Question a.
The place where two or more bones are connected is called a …………… .
Answer:
joint

Question b.
Cells of epidermis contain a pigment called ………… .
Answer:
melanin

Question c.
…………… and ……………. are the two layers of the human skin.
Answer:
epidermis, dermis

Question d.
The human skeletal, system is divided into ………….. parts.
Answer:
two

2. Match the pairs.

Question a.

Column ‘A’	Column ‘B’
1. Ball and socket joint	a. Knee
2. Hinge joint	b. Wrist
3. Gliding joint	c. Shoulder

Answer:

Column ‘A’	Column ‘B’
1. Ball and socket joint	c. Shoulder
2. Hinge joint	a. Knee
3. Gliding joint	b. Wrist

3. Right or wrong? If wrong, write the correct sentence. 

Question a.
Bones are soft.
Answer:
Wrong: Bones are hard.

Question b.
The human skeleton protects the internal organs.
Answer:
Right

4. Put a [✓] mark at the proper places.

Question a.
The system which gives our body. a definite shape to
(a) Excretory system [ ]
(b) Respiratory system [ ]
(c) Skeletal system [ ]
(d) Circulatory system [ ]
Answer:
(c) Skeletal system [✓]

Question b.
The ………… joint is seen in fingers and toes.
(a) Hinge joint [ ]
(b) Ball and socket joint [ ]
(c) Immovable joint [ ]
(d) Gliding joint [ ]
Answer:
(a) Hinge joint [✓]

5. Answer the following questions in your words.

Question a.
What are the functions of your skin?
Answer:
The functions of the skin are :

1. Protects the internal parts of the body like muscles, bones, organ systems etc.
2. Help to preserve the moisture in the body.
3. Synthesizing Vitamin D.
4. Regulates body temperature by releasing sweat.
5. Gives protection from heat and cold.
6. Functions as the sensory organ of touch

Question b.
What should you do to keep the bones strong and healthy?
Answer:
To keep the bones strong and healthy:

1. We should include calcium and phosphrous rich food in our diet.
2. We also include vitamin D rich food in our diet.
3. We get these from milk, milk products, leafy vegetables, meat and exposure to sunlight.
4. We should exercise regularly.

Question c.
What are the functions of human skeletal system?
Answer:
The functions of human skeletal system are:

1. Gives a definite shape to the body.
2. Provides support to the body.
3. Protects the delicate organs inside the body.

Question d.
Which are the various reasons due to which our bones might break?
Answer:
The bones in our body might break due to:

1. Lack of calcium and phosphorous.
2. Due to fracture because of an accident or a fall.
3. Lack of proper nutrition.
4. Due to deficiency of Vitamin D.

Question e.
What are the different types of bones? How many types are there? Give example of each.
Answer:
There are four types of bones in our body:

Types of Bone	Example
1. Flat bones	Sternum in the chest
2. Small bones	Stirrup in each ear
3. Irregular bones	Vertebra posterior (back side) of the body
4. Long bones	Femur or thigh bone

Types of Bone Example

1. Flat bones Sternum in the chest
2. Small bones Stirrup in each ear
3. Irregular bones Vertebra posterior (back side) of the body
4. Long bones Femur or thigh bone

6. What will happen if?

Question a.
There are no joints in our body.
Answer:
If there are no joints in our body, we will be standing like a tree without any movement, we can move only because of joints.

Question b.
There is no melanin pigment in our body.
Answer:
We will not have protection from ultraviolet rays. Our skin will become whitish.

Question c.
Instead of 33 vertebras in our body, we had one single and straight bone.
Answer:
We cannot bend down at our will.

7. Draw diagrams.

Question a.
Types of joints.
Answer:

Question b.
Structure of skin
Answer:

Activity:

Question 1.
Collect pictures of the different parts of the human skeletal system and paste them on chart paper. Write the functions of
each, too.

Question 2.
Collect the pictures, newspaper cuttings, etc. which show the skeletal systems of various animals and observe the differences between them.

Class 6 Science Chapter 8 Our Skeletal System and the Skin Important Questions and Answers

Choose the correct alternative:

Question 1.
The ………………….. protects the brain.
(a) skull
(b) rib cage
(c) spine
(d) none of above
Answer:
(a) skull

Question 2.
X-rays were discovered by …………………..  .
(a) Sir C.V.Raman
(b) Galileo
(c) Sir Isaac Newton
(d) Roentgen
Answer:
(d) Roentgen

Question 3.
The bones of ………………….. are immovable.
(a) hand
(b) leg
(c) spine
(d) skull
Answer:
(d) skull

Question 4.
We can move the bones of ………………….. in a 360° angle.
(a) elbow
(b) knee
(c) shoulder
(d) wrist
Answer:
(c) shoulder

Question 5.
Our body temperature usually remains constant at ………………….. °C.
(a) 32
(b) 35
(c) 37
(d) 40
Answer:
(c) 37

Question 6.
The part of the skin which maintains body temperature is ………………….. .
(a) Epidermis
(b) Dermis
(c) Subcutaneous layer
(d) Network of blood vessels and nerve fibers
Answer:
(c) Subcutaneous layer

Fill in the blanks:

Question 1.
Except for the …………….., none of the bones of the skull can move.
Answer:
lower jaw

Question 2.
The spinal cord originates from the …………… .
Answer:
brain

Question 3.
The longest and the strongest bone in the human body is …………… .
Answer:
femur

Question 4.
…………….. is the smallest bone in our body.
Answer:
stirrup

Question 5.
The vertical, flat bone in the chest is called the ……………… .
Answer:
sternum

Question 6.
The …………… joint moves in a 180° angle.
Answer:
hinge

Match the columns:

Question 1.

Column ‘A’	Column ‘B’
1. Skull	a. 25 bones
2. Rib cage	b. 6 bones
3. Spine	c. 22 bones
4. Both ears	d. 33 bones

Answer:

Column ‘A’	Column ‘B’
1. Skull	c. 22 bones
2. Rib cage	a. 25 bones
3. Spine	d. 33 bones
4. Both ears	b. 6 bones

Question 2.

Column ‘A’	Column ‘B’
1. Lower jaw	a. Movable joint
2. Ears	b. Femur
3. Thigh	c. Movable joint in skull
4. Elbow	d. Smallest bone

Answer:

Column ‘A’	Column ‘B’
1. Lower jaw	c. Movable joint in skull
2. Ears	d. Smallest bone
3. Thigh	b. Femur
4. Elbow	a. Movable joint

Right or Wrong? If wrong, write the correct answers:

Question 1.
The spine is a part of the appendicular skeleton.
Answer:
Wrong: The spine is a part of the axial skeleton.

Question 2.
Ankle joints are gliding joints.
Answer:
Right

Question 3.
All the skull joints are immovable.
Answer:
Wrong: Except lower jaw, all the skull joints are immovable.

Question 4.
The skin maintains normal body temperature.
Answer:
Right

Answer in one word:

Question 1.
The part which protects the heart and lungs.
Answer:
Rib cage

Question 2.
Ali falls down and his elbow is broken.
Answer:
Fracture

Question 3.
The image which spots the broken bone.
Answer:
X-ray

Question 4.
The biotic component of our body.
Answer:
Bone cell

Question 5.
The part which protects the vertebral column.
Answer:
Spine

Question 6.
The part which connects the bone in our body.
Answer:
Ligament

Question 7.
The organ which helps us to sense whether something is hot or cold.
Answer:
Skin

Question 8.
The pigment which gives colour to the skin.
Answer:
Melanin

Can you tell?

Question 1.
What is a fracture? How will you help a friend who has met with an accident and fractured his leg?
Answer:
Fracture is a crack or break in a bone. Fracture may occur due to accident or fall from height or injury. If my friend’s leg is fractured, then. I would –

1. Ask him to prevent any movement of the fractured part.
2. Get immediate medical help.
3. Take the x-ray image of the fractured or swollen part.
4. An x-ray image shows the exact spot where the bone is broken. This will help in providing proper treatment.

Question 2.
What are the properties of bones?
Answer:
The properties of bones are:

1. Bones are hard and not flexible.
2. Bone cells are composed of two main constituents:
   • Bone cells are biotic components.
   • Calcium carbonate, calcium phosphate, minerals and salts are abiotic components.
3. Calcium imparts strength to bones.
4. As we grow the size and length of bones increases upto a certain limit.

Question 3.
What is human skeletal system? How is it divided?
Answer:

1. All the bones together form a framework or a skeleton.
2. All the bones of the body along with cartilage together form the skeletal system.
3. The human skeletal system can be divided into two parts – the axial skeleton and the appendicular skeleton.
4. The axial skeleton consists of the skull, the spine and the rib cage. These are situated symmetrically along the central axis.
5. The appendicular skeleton consists of the bones of arms and legs on either side of the central axis.

Question 4.
What is a joint? What are it’s types?
Answer:
Joints are places where two or more than two bones are connected to each other.

Question 5.
Describe the structure of skin.
Answer:

1. Human skin is made up of two main layers- outermost layer, epidermis and layer below it called dermis.
2. Below dermis there is a network of blood vessels and nerve fibers.
3. Under this layer there is a subcutaneous layer, which maintains body temperature.
4. The epidermis has various layers.
5. There are sweat glands in the skin which secrete sweat.

Question 6.
Write a short note on melanin.
Answer:

1. Melanin is a pigment present in the cells of epidermis.
2. Melanin is synthesized in certain glands in the skin.
3. The percentage of melanin decides the fairness or darkness of the skin.
4. Melanin protects our skin and the inner parts from ultraviolet sunrays.

Use your brain power!

Question 1.
Which colour of the skin will give greater protection from sun’s rays?
Answer:
Darker colour will give greater protection.

Give scientific reasons:

Question 1.
We are able to bend down at our will.
Answer:

1. 33 bones of the spine are placed straight one above the other.
2. They are arranged flexibly.
3. Their flexibility allows us to bend down at our will.

Question 2.
Calcium is an important mineral.
Answer:

1. Calcium imparts strength to our bones.
2. If we are calcium deficient, possibility of bone fracture during a fall or an accident increases.
3. Hence, calcium is an important mineral.

Question 3.
Sweating helps to lower the body temperature.
Answer:

1. In the hot sun, the temperature of the skin rises.
2. The sweat is released.
3. The heat required for the evaporation of sweat is drawn from the body itself.
4. Hence, sweating lowers the body temperature.

Question 4.
Some people have jet black hair, while others have brown or reddish hair.
Answer:

1. It is melanin that determines the colour of our hair.
2. Jet black hair is due to pure melanin.
3. Brown hair is due to sulphur in the melanin.
4. Reddish hair is due to iron in the melanin.

Question 5.
Observe and discuss:
Your grandmother has wrinkles on her skin.
Answer:

1. As we grow older, the proportion of fat beneath the skin reduces.
2. However, previously tout skin does not shrink.
3. This causes wrinkles on the face of older people.

What will happen if:

Question 1.
If skin had no sweat glands.
Answer:
Skin regulates body temperature by releasing sweat. If skin had no sweat glands then we will not be able to maintain our body temperature at a constant 37°C.

Can you recall?

Question 1.
Which organ help us to sense whether something is hot or cold, rough or smooth, etc?
Answer:
The skin functions as the sensory organ of touch.

Question 2.
What happens when we walk or play in the hot sun?
Answer:
When we walk or play in the sun, we get tired, our skin secrete sweat.

Observe the figure and label as directed.

Question 1.

In the above figure label the parts marked a, b, c, d, e and hence show axial and appendicular
skeleton.
Answer:
(a) Skull
(b) Rib cage
(c) Spine
(d) Arm
(e) Leg
Axial skeleton: skull, the spine and rib cage
Appendicular: legs, arms

Question 2.

In the given figure, name the type of bones marked a, b, c, d. State where they are seen in our body.
Answer:
(a) Flat bones – rib cage and gliding joint
(b) small bones – finger
(c) Irregular bones – vertebal column
(d) Long bones – legs, arms

6th Std Science Questions And Answers:

• Natural Resources – Air, Water and Land Class 6 Questions And Answers
• The Living World  Class 6 Questions And Answers
• Diversity in Living Things and their Classification Class 6 Questions And Answers
• Disaster Management Class 6 Questions And Answers
• Substances in the Surroundings – Their States and Properties Class 6 Questions And Answers
• Substances in Daily Use Class 6 Questions And Answers
• Nutrition and Diet Class 6 Questions And Answers
• Our Skeletal System and the Skin Class 6 Questions And Answers
• Motion and Types of Motion
• Force and Types of Force Class 6 Questions And Answers

Balbharti Maharashtra State Board Class 6 Science Solutions Chapter 16 The Universe Notes, Textbook Exercise Important Questions and Answers.

Std 6 Science Chapter 16 The Universe Question Answer Maharashtra Board

Class 6 Science Chapter 16 The Universe Question Answer Maharashtra Board

1. Name these.

Question a.
Birthplace of stars.
Answer:
Nebulae

Question b.
The biggest planet in the Solar System.
Answer:
Jupiter

Question c.
The galaxy which is our neighbour.
Answer:
Andromeda

Question d.
The brightest planet in the solar system.
Answer:
Venus

Question e.
Planet with the largest number of satellites.
Answer:
Jupiter

Question f.
Planet without a single satellite.
Answer:
Venus and Mercury

Question g.
Planet with a rotation different from other planets.
Answer:
Venus

Question h.
A celestial body that carries a tail along.
Answer:
Comet

2. Fill in the blanks.

Question a.
The group of galaxies of which our Milky Way is a part is called ………….. .
Answer:
Local group

Question b.
Comets are made of ………… .
Answer:
ice and dust particles

Question c.
The planet ……………… appears as if it is rolling along its orbit.
Answer:
Uranus

Question d.
…………….. is a stormy planet.
Answer:
Jupiter

Question e.
The pole star is the best example of a ………………. type of star.
Answer:
variable

3. Say if the statements given below are right or wrong. Rewrite the statements after correcting them.

Question a.
Venus is the planet closest to the sun.
Answer:
Wrong: Mercury is the planet closest to the sun.

Question b.
Mercury is called a stormy planet.
Answer:
Wrong: Jupiter is called a stormy planet.

Question c.
Jupiter is the biggest planet.
Answer:
Right

4. Answer the following.

Question a.
What is a special characteristic of the planet Mars?
Answer:
The highest and the longest mountain in the solar system ‘Olympus Mons’ is located on Mars.

Question b.
What are the type of galaxies?
Answer:
The different types of galaxies identified according to their shapes are spiral, elliptical, barred spiral, irregular.

Question c.
Which celestial bodies does a galaxy include?
Answer:
Galaxy includes stars, their planetary system, cluster of stars, nebulae, clouds of gases, clouds of dust, dead stars, newly bom stars etc.

Question d.
Name the different types of stars.
Answer:
The different types of stars are

1. Sun-like stars e.g. stars like Sirius, Alpha Centauri
2. Red Giants Stars
3. Super Nova
4. Binary or Twin Stars
5. Variable Stars e.g. Polaris (pole star)

Question e.
What are the types of comets and on what basis are they classified?
Answer:

1.  Comets are of two types: Long-period comets and short-period comets.
2. Classification of comets is based on the time (period) taken by the comets to complete one revolution around the sun.

Question f.
What is the difference between meteors and meteorites?
Answer:

1. Meteors are rocky pieces originating from the asteroid belt. Smaller rocky pieces get completely burnt due to friction with air after they enter the earth’s atmosphere.
2. Meteors which do not bum completely and fall to the surface of the earth are called meteorites.

Question g.
What are the characteristics of the planet Neptune?
Answer:
Neptune is the eighth planet in the solar system. A season on Neptune lasts for about 41 years. On this planet winds blow with extremely high speed.

5. Match the following.

Question a.

Group ‘A’	Group ‘B’
1. Galaxy	(a) From east to west
2. Comet	(b) 33 satellites
3. Sun-like star	(c) Spiral
4. Saturn	(d) Sirius
5. Venus	(e) Halley

Answer:

Group ‘A’	Group ‘B’
1. Galaxy	(c) Spiral
2. Comet	(e) Halley
3. Sun-like star	(d) Sirius
4. Saturn	(b) 33 satellites
5. Venus	(a) From east to west

Activity:

Question 1.
Using the material you can find in your house, prepare a model of the solar system.

Question 2.
Collect information about different aspects of each planet such as its distance from the sun, its diameter, its volume, etc. and present it in a science exhibition.

Class 6 Science Chapter 16 The Universe Important Questions and Answers

Fill in the blanks.

Question 1.
The Milky Way is known as ………….. .
Answer:
Mandakini

Question 2.
The ………….. is a galaxy in which our solar system is located.
Answer:
Milky Way

Question 3.
The galaxy that is closest to our Milky Way is ………….. .
Answer:
Andromeda

Question 4.
The universe includes innumerable galaxies, the space between them and also ………….. .
Answer:
energy

Question 5.
The Milky Way is a part of the ………….. of galaxies.
Answer:
Local group

Question 6.
Generally, the surface temperature of stars ranges from 3500° C to ………….. .
Answer:
50000°C

Question 7.
The colour of stars changes according to their ………….. .
Answer:
temperature

Question 8.
Red giants stars are ………….. in colour.
Answer:
red

Question 9.
Super Nova stars are ………….. and ………….. than the red giant stars.
Answer:
brighter, larger

Question 10.
More than ………….. of the stars in the sky are ………….. stars.
Answer:
half, binary

Question 11.
The ………….. and ………….. of variable stars is not stable.
Answer:
luminance, shape

Question 12.
When a star contracts, its surface temperature ………….. and the star emits ………….. energy and appears ………….. .
Answer:
increases, greater, brighter

Question 13.
The sun which is at the centre of the solar system is a ………….. coloured star.
Answer:
yellow

Question 14.
The diameter of the sun is approximately ………….. km.
Answer:
13, 92, 000

Question 15.
………….. is the fastest moving planet.
Answer:
Mercury

Question 16.
………….. is the brightest planet in the solar system.
Answer:
Venus

Question 17.
………….. is the hottest planet.
Answer:
Venus

Question 18.
As the earth is a ………….. there is a magnetic field around the earth.
Answer:
magnet

Question 19.
Mars is also called the ………….. .
Answer:
Red planet

Question 20.
As the soil on Mars contains ………….. its colour is reddish.
Answer:
iron

Question 21.
………….. planets of the size of the earth can get accommodated on Jupiter.
Answer:
1397

Question 22.
Jupiter is called as ………….. .
Answer:
The stormy planet

Question 23.
Saturn mass is ………….. times that of the earth.
Answer:
95

Question 24.
………….. cannot be seen without a telescope.
Answer:
Uranus

Question 25.
Winds blow with extremely high speed on ………….. .
Answer:
Neptune

Question 26.
………….. is the satellite of the earth.
Answer:
The moon

Question 27.
The moon’s period of ………….. and ………….. are both of 27.3 days.
Answer:
rotation, revolution

Question 28.
………….. is classified as a dwarf planet.
Answer:
Pluto

Question 29.
Pluto takes ………….. years to complete its revolution around the sun.
Answer:
248

Question 30.
………….. are formed out of ice and dust particles.
Answer:
Comets

Question 31.
………….. lake in Maharashtra has been formed by the impact of such a meteorite.
Answer:
Lonar

Can you tell?

Question 1.
Which celestial bodies form the solar system?
Answer:
Sun, the eight planets – Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, their satellites, Dwarf planets, asteroids, meteors and comets all together form our solar system.

Question 2.
What is the difference between stars and planets?
Answer:

Stars	Planets
1. Stars are the celestial bodies which can emit heat and light continuously.	1. The celestial bodies which revolve around the sun in certain orbit are called planets.
2. Stars twinkle in the sky.	2. Planets do not twinkle in the sky.
3. They have their own light.	3. They do not have their own light.
4. They are fixed at a point.	4. They revolve around the sun.
5. They are very big in size.	5. Planets are small as compared to

Question 3.
How many planets are there in our solar system?
Answer:
There are 8 planets in our solar system.

Question 4.
What is to be found between Mars and Jupiter?
Answer:
A belt of celestial bodies called as asteriods is found between the planets Mars and Jupiter.

Question 5.
Have you ever seen in the evening or in the pre-dawn hours a large celestial body with a long tail? What is it called?
Answer:
Yes, it is a comet – a large celestial body with a long tail. I have not seen it, but heard that in 1986 there was a Halley’s comet seen in the Indian sky.

Use your brain power!

Question 1.
Why do we see only one side of the moon?
Answer:
As the moon revolves around the earth it also rotates around itself. The moon takes 27.3 days to complete one revolution around the earth. It takes the moon the same time to complete one rotation around itself. Therefore, only one side of moon is visible.

Question 2.
Which planet has a day longer than its year?
Answer:
A planet’s day is how long it takes to complete one rotation on its own axis. Venus takes 243 earth days to complete one rotation because of its slow rotation around its axis. A year is the time taken by the planet to complete one revolution around the sun. Venus completes one revolution around the sun in 225 days. This makes a day longer than a year on Venus.

Answer in one sentence.

Question 1.
What is the Milky Way?
Answer:
Milky way is the galaxy in which our solar system is located.

Question 2.
What is a galaxy?
Answer:
A group of innumerable stars and their planetary systems are together known as galaxy.

Question 3.
What does the Universe include?
Answer:
The universe includes innumerable galaxies, the space between them and also energy.

Question 4.
What different colours do the stars radiate?
Answer:
The stars radiate different colours such as blue, white, yellow and red.

Question 5.
Where are stars bom?
Answer:
The birth place of stars are the huge nebulae, made of dust particles and gases.

Question 6.
What is the surface temperature of the sun?
Answer:
The surface temperature of the Sim is around 6,000°C.

Question 7.
What is the size of the sun?
Answer:
The size of the sun is so huge that around 13 lakh planets of the size of the earth can be easily placed within it.

Question 8.
How does the sun balance the other celestial bodies?
Answer:
Due to the gravitational force of the sun, the celestial bodies in the solar system revolve around it.

Question 9.
How does the sun move in the Milky Way?
Answer:
The sun rotates around its axis and while doing so, it revolves around the centre of the Milky Way taking the solar system along with it.

Question 10.
Which planet doesn’t have atmosphere?
Answer:
Mercury doesn’t have atmosphere.

Question 11.
How much time does the earth take to complete one rotation and one revolution?
Answer:
The earth completes one rotation in 24 hrs and one revolution in 365 days i.e. 1 year.

Question 12.
Which planets have rings around them?
Answer:
Jupiter, Saturn, Uranus, Neptune have rings around them.

Question 13.
Which planet do not have rings around them?
Answer:
Mercury, Venus, Earth and Mars do not have rings around them.

Question 14.
State two properties of planet Mercury.
Answer:
Mercury is the closet planet to the Sim. Mercury is the fastest moving planet.

Question 15.
When is the Mercury visible to us?
Answer:
Mercury is visible in the morning and in the evening if it is away from the sun.

Question 16.
What is seen on the surface of the mercury?
Answer:
A number of depressions which are actually caused by meteoric falls are seen on the surface of mercury.

Question 17.
When is Venus seen in the sky?
Answer:
Venus is seen in the sky in the east before the sunrise and in the west after the sunset. It rotates around itself from east to west.

Question 18.
How does earth protect us from harmful rays of Sun?
Answer:
As the earth is a magnet there is a magnetic field around the earth. It diverts the harmful rays from the sun towards the polar regions of the earth.

Question 19.
What is Olympus Mons?
Answer:
Olympus Mons is the highest and longest mountain in the solar system located on Mars.

Question 20.
Which is the largest planet of the solar system?
Answer:
The Jupiter is the largest planet of the solar system.

Question 21.
Why is Saturn considered a peculiar planet?
Answer:
Saturn considered a peculiar planet because of the rings around it.

Question 22.
How is the axis of Uranus?
Answer:
Uranus axis is so greatly inclined that it appears as if it is rolling along on its axis.

Question 23.
How are seasons on Neptune?
Answer:
The seasons on Neptune last for about 41 years.

Question 24.
What is a satellite?
Answer:
The celestial bodies that revolve around a planet , without independently revolving around the sun are called Satellite.

Question 25.
What is an Asteroid?
Answer:
A great number of small sized bodies could not turn into planets when the solar system was formed, but continued to revolve around the sun. This bodies are known as asteroids.

Question 26.
What is a Dwarf Planet?
Answer:
A small sized celestial body that revolves independently around the sun is called the dwarf planet.

Question 27.
What is a comet?
Answer:
A comet is a celestial body that revolves around sun. Comets are formed out of ice and dust particles.

Question 28.
What are meteors?
Answer:
Meteors are rocky pieces originating from the asteroids belt.

Question 29.
What are meteorites?
Answer:
Meteors which do not bum completely and fall to the surface of the earth are called meteorites.

Give reasons for the following.

Question 1.
Comets came to be called ‘dirty snowballs’.
Answer:
Comets consist of an icy cluster of various constituents like dust particles. Hence it is called dirty snowballs.

Question 2.
Comets are visible when they are close.
Answer:
Comets are formed out of ice and dust particles. They appear like points when they are far away from the sun, but when they are close to the sun they become easily visible to us because of the shorter distance and the heat of the sun.

Question 3.
Comets appear to have a long feathery tail.
Answer:
Comets are made up of frozen matter and dust particles. When they are close to the sun this frozen matter gets converted into gas due to the solar heat. These gases get thrown in a direction away from the sun. As a result comets appear to have a long feathery tail.

Question 4.
Pluto is called as a dwarf planet.
Answer:
Pluto is a small sized celestial body that revolves independently around the sun.

Question 5.
Moon is a satellite of the earth.
Answer:
Moon revolves around the earth without independently revolving around the sun. Hence moon is a satellite of the earth.

Question 6.
Mars is called the Red Planet.
Answer:
As the soil on the Mars contains iron its colour is reddish. Hence Mars is also called the RedPlanet.

Question 7.
Jupiter is called the Stormy Planet.
Answer:
Jupiter revolves around itself with a great speed. Hence Jupiter is called the Stormy planet.

Question 8.
Uranus appears rolling along on its orbit.
Answer:
Uranus axis is so greatly inclined that it , appears as if it is rolling along on its orbit.

Question 9.
Saturn is considered to be a peculiar planet.
Answer:

1. Saturn is considered as peculiar planet because of its rings around it.
2. Though its mass is 95 times that of the earth, its density is very low.
3. If it were dropped into a large sea enough to hold it, it would float in it.

6th Std Science Questions And Answers:

• Work and Energy Class 6 Questions And Answers
• Simple Machines Class 6 Questions And Answers
• Sound Class 6 Questions And Answers
• Light and the Formation of Shadows Class 6 Questions And Answers
• Fun with Magnets Class 6 Questions And Answers
• The Universe Class 6 Questions And Answers

Balbharti Maharashtra State Board Class 6 Science Solutions Chapter 12 Simple Machines Notes, Textbook Exercise Important Questions and Answers.

Std 6 Science Chapter 12 Simple Machines Question Answer Maharashtra Board

Class 6 Science Chapter 12 Simple Machines Question Answer Maharashtra Board

1. Classify the following as a lever, a pulley and an inclined plane:
(A wedge, a needle, a staircase, a slide, the wheel of a flagpole, nutcrackers, scissors, an opener, an axe, a crane, a knife)

Question a.
Classify the following as a lever, a pulley and an inclined plane:
(A wedge, a needle, a staircase, a slide, the wheel of a flagpole, nutcrackers, scissors, an opener, an axe, a crane, a knife)
Answer:

Inclined plane	Pulley	Lever
Wedge	Wheel of flagpole	Nutcracker
Needle	Crane	Scissors
Staircase		Opener
Slide
Axe
Knife.

2. Fill in the blanks using the proper word and complete the statements.

Question a.
The ………….. in the centre, the ………….. on one side and the on the ………….. other side make a lever of the first order.
Answer:
Fulcrum, load and effort

Question b.
The ………….. in the centre, the ………….. on one side and the ………….. on the other side make a lever of the second order.
Answer:
Load, fulcrum, effort

Question c.
The ………….. in the centre, the ………….. on one side and the ………….. on the other side make a lever of the third order.
Answer:
Effort, fulcrum, load

3. Which machines will you use to do the following work? Write their types.

Question a.
To remove the lid of a tin. Opener Lever of the second order
Answer:

• Work: To remove the lid of a tin.
• Machine: Opener
• Machine: Lever of the second order

Question b.
To lift bricks to the top of a tall building Crane Complex machine
Answer:

• Work: To lift bricks to the top of a tall building
• Machine: Crane
• Machine: Complex machine

Question c.
To cut vegetable Knife Wedge – Simple machine
Answer:

• Work: To cut vegetable
• Machine: Knife
• Machine: Wedge – Simple machine

Question d.
To draw water from a well Pulley Simple machine
Answer:

• Work: To draw water from a well
• Machine: Pulley
• Machine: Simple machine

Question e.
To hold a papad for roasting it. A pair of tongs Lever of the third order
Answer:

• Work: To hold a papad for roasting it.
• Machine: A pair of tongs
• Machine: Lever of the third order

4. Write the answers to the following questions in your own words. 

Question a.
What is meant by a simple machine?
Answer:

1. Machines which have only one or two parts and a simple and easy structure are simple machines.
2. Example: the bottle opener, nail cutter.
3. Simple machines can be handled easily.
4. We use many simple machines in our day to day life.

Question b.
Mention the advantages of using a machine.
Answer:

1. Machines, simple or complex, are used to get more work done in less time and with less effort.
2. Machines are used to accomplish certain tasks more easily.
3. Use of simple or complex machines depends upon the task to be carried out and the time and the efforts required to do it.

Question c.
What is meant by a complex machine?
Answer:

1. Complex machines have many parts which carry out many processes for completing a task.
2. For this purpose the parts are joined to one another.
3. Therefore, these machines are called complex machines.
4. Some of the parts of such complex machines are actually simple machines.
5. The structure of complex machine is complicated.

Question d.
What is a lever? How is the order of the lever determined?
Answer:

1. Lever is a simple machine made up of 3 parts: Load, effort and fulcrum.
2. Order of the lever are determined on the position of the effort, the fulcrum and the load.

5. Why is this so?

Question a.
Traveller’s bags have wheels.
Answer:

1. Combination of wheel and axle is a simple machine.
2. When the axle starts rotating due to force applied, the wheel fitted to it also starts rotating.
3. This makes easier for travellers to carry heavy load.
4. Instead of lifting heavy bag, to drawing it on wheels require less energy. Therefore, traveller’s bag have wheels.

Question b.
Machines have to be maintained.
Answer:

1. Parts of machines rub against one another when they are used.
2. Soiled, dusty parts create more friction. Some parts are affected by the weather, rust and corrosion.
3. Machines get damaged or become useless due to such wear and tear. Hence to avoid this, machines should be maintained properly to keep them in good working condition.

Question c.
A bicycle is said to be a complex machine.
Answer:

1. Bicycle has a complicated structure.
2. Bicycle has many parts which carry out many processes for completing a task.
3. Many parts of bicycle such as pedals, wheels, axle, handle are actually simple machines.
4. The parts of a bicycle are joined to one another – making it a complex machine.

6. Name the levers mentioned in the following passage. Identify the fulcrum, load and effort of each and say which type of lever it is.

Ravi and Savita sit on a sea-saw in a garden. In the mean time, a gardener is trimming trees in the garden. He puts the leaves and other garbage in the wheelbarrow. Later, Ravi gets thirsty and he buys lemon sherbet. The sherbet seller cuts the lemon and squeezes it using a lemon squeezer. He puts small pieces of ice in the glass with the help of the tongs.

Question a.
Name the levers mentioned in the following passage. Identify the fulcrum, load and effort of each and say which type of lever it is.

Ravi and Savita sit on a sea-saw in a garden. In the mean time, a gardener is trimming trees in the garden. He puts the leaves and other garbage in the wheelbarrow. Later, Ravi gets thirsty and he buys lemon sherbet. The sherbet seller cuts the lemon and squeezes it using a lemon squeezer. He puts small pieces of ice in the glass with the help of the tongs.
Answer:
Levers:

1. See – saw – lever of the first order.
   Load – fulcrum – effort.
2. Wheelbarrow – lever of the second order.
   Fulcrum – load – effort.
3. Lemon squeezers – lever of the second order.
   Fulcrum – load – effort.
4. Tongs – lever of the third order.
   Fulcrum – effort – load.

Activity:

Question 1.
Make a list of the various machines used in your home and neighborhood and write their types.

Question 2.
Go to a bicycle repair shop, observe how a bicycle is repaired, and note down the information.

Class 6 Science Chapter 12 Simple Machines Important Questions and Answers

Fill in the blanks.

Question 1.
Simple machines can be handled ………….. .
Answer:
easily

Question 2.
The structure of complex machine is ………….. .
Answer:
complicated

Question 3.
The more gradual the the ………….. lesser is the we bear. But, such an inclined plane is ………….. .
Answer:
slope, weight, longer

Question 4.
The steeper the ………….. , the ………….. is the inclined plane. But we have to bear a …………. weight.
Answer:
slope, shorter, greater

Question 5.
A screw is like a rolled up inclined plane made of an ………….. strip.
Answer:
iron

Question 6.
A wedge is used for ………… an object into two pieces or to ………….. the objects stuck together.
Answer:
breaking, separate

Question 7.
A farmer uses a strong …………. to remove the big stone bogged down in the farm.
Answer:
crow-bar

Question 8.
A device with a grooved wheel and thread designed to lift weights is called a …………. .
Answer:
pulley

Question 9.
When we use a pulley, force is applied in the downward direction for lifting the weight in an …………. direction.
Answer:
upward

Question 10.
Combination of an axle and a wheel is a …………. machine.
Answer:
simple

Question 11.
A needle and a nail are also kind of …………. .
Answer:
wedge

Question 12.
Machines are covered when not in use to prevent …………. settling on them.
Answer:
dust

Question 13.
In Archimedes’ screw, the pipe was placed at an angle of …………. with one end inside the …………. and the rod resting on a …………. .
Answer:
45°, water, flat surface.

Match the columns:

Question 1.

Column ‘A’	Column ‘B’
1. Pair of Scissors	a. Third order of lever
2. Tongs	b. Second order of lever
3. Opener	c. First order of lever

Answer:

Column ‘A’	Column ‘B’
1. Pair of Scissors	c. First order of lever
2. Tongs	a. Third order of lever
3. Opener	b. Second order of lever

Question 2.

Column ‘A’	Column ‘B’
1. Inclined plane	a. Needle
2. Pulley	b. Screw
3. Wedge	c. Crane

Answer:

Column ‘A’	Column ‘B’
1. Inclined plane	b. Screw
2. Pulley	c. Crane
3. Wedge	a. Needle

State whether the following statements are ‘true’ or ‘false’.

Question 1.
Lever helps big vehicle to climb up and down the mountain easily.
Answer:
False

Question 2.
Combination of wheel and axle is a simple machine.
Answer:
True

Question 3.
In pulley, force can be applied in upward direction.
Answer:
False

Question 4.
Screw is an example of wedge.
Answer:
False

Question 5.
In Archimedes screw, the rod rests on flat surface.
Answer:
True

Question 6.
A slanting plank is used to lift a weight.
Answer:
True

Question 7.
A winding road or ghat is an example of lever of first order.
Answer:
False

Answer the following questions in one sentence.

Question 1.
What is a machine?
Answer:
Devices which are used to get more work done in less time and less effort are called machines.

Question 2.
What is a simple machine?
Answer:
Machines which have only one or two parts and a simple and easy structure are called simple machines.

Question 3.
What is a complex machine?
Answer:
Some machines have many parts and they carry out many processes for completing a task. For this purpose, the parts are joined to each other. They are called complex machines.

Question 4.
List the properties of simple machines.
Answer:
Properties of simple machine are:

1. They are made up of only one or two parts.
2. They have a simple and easy structure.
3. They can be handled easily.
4. There are less chances of simple machines breaking down or getting damaged.

Question 5.
List properties of complex machines.
Answer:
Properties of complex machine are:

1. These machines have many parts to carry out many processes.
2. The parts are joined to one another.
3. The structure of complex machines is complicated.
4. Some parts of complex machines are actually simple machines.

Question 6.
What is an inclined plane?
Answer:
A slanting plank which is used to lift a weight on which we bear less weight and lifting becomes easier is an inclined plane.

Question 7.
What is a screw?
Answer:
A screw is like a rolled up inclined plane made up of iron strip.

Question 8.
What is a wedge?
Answer:
A wedge is used for breaking an object into two pieces or to separate objects stuck together.

Question 9.
State examples of wedges.
Answer:
An axle, a knife, a chisel, a needle and a nail are different kinds of wedges.

Question 10.
What is a lever?
Answer:
A lever is a machine made up of 3 parts: effort, load and fulcrum.

Question 11.
What is a fulcrum?
Answer:
The support at which the rod of a lever is rested is called fulcrum of a lever. The lever rotates about the fulcrum.

Question 12.
What is a load?
Answer:
The weight lifted by a lever or the force against which the lever acts is called a load.

Question 13.
What is a load arm?
Answer:
The arm of the lever from the fulcrum to the load is called a load arm.

Question 14.
What is an effort?
Answer:
The force applied on the other end of the rod to lift the load is called an effort.

Question 15.
What is an effort arm?
Answer:
The part of the lever from the fulcrum to the effort is called an effort arm.

Question 16.
What is lever of the first order?
Answer:
The fulcrum is in the centre, the load is at one end while effort is at other end.

Question 17.
What is lever of the second order?
Answer:
The load is in the centre, the fulcrum on one side, and the effort on the other side.

Question 18.
What is lever of the third order?
Answer:
The effort is in the centre, the fulcrum on one side, and the load on the other side.

Question 19.
What is a pulley?
Answer:
A pulley is a device with a grooved wheel and thread designed to lift weights.

Question 2.
How does a pulley help us?
Answer:
If we use a pulley, force can be applied in the downward direction for lifting the weight in an upward direction. It is convenient and easy.

Give scientific reasons:

Question 1.
We use many simple machines in our day-to-day life.
Answer:
Simple machines can be handled easily and there are less chances of these machines breaking down or getting damaged. Hence, we use many simple machines in our day-to-day life.

Question 2.
Less force is required to fit a screw than to hammer a nail.
Answer:

1. A screw is like a rolled-up inclined plane of an iron strip.
2. When a screw is fitted in wood it goes in as if it is going down an inclined plane.
3. Therefore, less force is required to fit a screw than hammer a nail.

Question 3.
Big vehicles easily climb up and down the mountains than a pathway.
Answer:
A winding road or ghat that goes up a mountain is like an inclined plane wrapped around the mountain. It helps big vehicles to climb, up and down the mountain easily.

Question 4.
Oil or lubricant is released between parts of machine.
Answer:
Oil or lubricant is released between parts that rub against each other so that there is less friction between them and wearing is reduced.

Question 5.
Machines are covered when not in use.
Answer:
Machines are covered when not in use to prevent dust settling on them.

Question 6.
How are machines protected from the effect of weather?
Answer:
To prevent the effect of weather, metallic parts in a machine are painted externally and the machines are always kept dry.

Draw the neat and labelled diagram of following:

Question 1.
The screw as an inclined plane.
Answer:

Question 2.
Archimedes’ screw
Answer:

Observe the following diagram and identify the order of lever.

Question 1.
Removing the lid.
Answer:

Question 2.
Picking up an object.
Answer:

Question 3.
Lifting a paper weight.

Answer:

1. Lever of the second order
2. lever of third order
3. Level of first order.

Answer each of the question in brief:

Question 1.
With the help of the diagram explain lever of the 1st, 2nd, 3rd order.
Answer:
1. Lever of the First order: The fulcrum is in the centre, the load is at one end, while the effort is at the other end. e.g. scissors

2. Lever of the Second order: The load is in the centre, the fulcrum on one side, and the effort on the other side. e.g. lid opener

3. Lever of the Third order: The effort is in the centre, the fulcrum on one side, and the load on the other side. e.g. Tongs

Question 2.
How can machines be maintained?
Answer:

1. To maintain machines, all its parts are wiped clean.
2. Oil or lubricant is released between parts that rub against each other.
3. Machines are covered, painted externally and always kept dry.

Question 3.
What is an inclined plane? Explain longer and shorter inclined plane.
Answer:

1. A slanting plank used to lift a weight, is called an inclined plane. Because of inclined plane we will experience less weight and weight lifting become easier.
2. Longer inclined plane: When the inclined plane is longer, the slope is more gradual and lesser is the weight we bear.
3. Shorter inclined plane: When the inclined plane is shorter, the slope is steeper and greater is the weight we bear.

Question 6.
Explain the working of a giant wheel.
Answer:

1. The giant wheel is fitted to a rod at its centre. This rod is called an axle.
2. When the axle starts rotating with the help of electricity the wheel fitted to it starts rotating.
3. This combination of an axle and a wheel is a simple machine.

Observe and discuss:

Question 1.
Name the devices and discuss how they help.

Answer:

1. Needle and thread – Stitching of clothes
2. Wheelbarrow – To carry materials.
3. Opener – To open the lids of bottles.
4. Pulley – To lift bucket
5. Nail cutter – To cut nails
6. Axe – To cut wood into small pieces

Can you tell?

Question 1.
Observe the machines shown in the following pictures. For what purposes are they used? Can you name some other machines of this kind?

Answer:

1. Mixer grinder – To grind the foodstuffs
2. Scooter – To ride and reach places
3. Bicycle – To ride and reach places
4. Sewing machine – To stitch clothes
5. Wheel chair – Specially designed for handicapped patients to move around.

Question 2.
Compare the pathway and a road, available to climb the mountain, the time and strength and your convenience, required to reach the mountain top.
Answer:
We can reach the mountain top by climbing the pathway early than by the road. The time required is less but the strength required is more. The road is easy to walk and more time consuming.

Question 3.
If the point of a needle or the edge of a knife become blunt, then the needle does not penetrate the cloth and the knife does not cut into the fruit. Why is this so?
Answer:
The tip of the needle or the edge of a knife becomes blunt due to regular use. Both the knife and the needle lose their sharpness.

Use your brain power!

Question 1.
Which task can be done using a lever?
Answer:
Task such as using a nut cracker, cutting paper with scissors, can be done using a lever.

Question 2.
Some machines we use in our day to day life are shown in picture. What is the type in each of these?

Answer:

• Wheelbarrow – Lever of the third order
• Pair of tongs – Lever of the first order
• See – saw – Lever of the first
• order Cutter – Lever of the second lever
• Pair of Scissors – Lever of the first order.

Question 3.
When the pedal of the bicycle is rotating, the wheel starts rotating. How does this happen?
Answer:
Pedals of the bicycle are connected to the wheels through the axle, when the axle starts rotating, the wheels also start rotating.

Question 4.
Examples of pulley.
Answer:

1. A simple pulley is used to hoist a flag, to draw water from a well.
2. The crane which is used to lift heavy loads is an example of application of pulleys and levers working together.

6th Std Science Questions And Answers:

• Work and Energy Class 6 Questions And Answers
• Simple Machines Class 6 Questions And Answers
• Sound Class 6 Questions And Answers
• Light and the Formation of Shadows Class 6 Questions And Answers
• Fun with Magnets Class 6 Questions And Answers
• The Universe Class 6 Questions And Answers

Balbharti Maharashtra State Board Class 6 Science Solutions Chapter 3 Diversity in Living Things and their Classification Notes, Textbook Exercise Important Questions and Answers.

Std 6 Science Chapter 3 Diversity in Living Things and their Classification Question Answer Maharashtra Board

Class 6 Science Chapter 3 Diversity in Living Things and their Classification Question Answer Maharashtra Board

1. Match the pairs.

diversity in living things and their classification class 6 exercise Question 1.

Column ‘A’	Column ‘B’
1. Amphibians	a. A monkey
2. Vertebrates	b. A snake
3. With scales	c. A frog

Answer:

Column ‘A’	Column ‘B’
1. Amphibians	c. A frog
2. Vertebrates	a. A monkey
3. With scales	b. A snake

2. Who is the odd one out?

Question a.
Fungus, mushroom, chrysanthemum, spirogyra
Answer:
Chrysanthemum (only flowering plants)
or
Spirogyra (only aquatic plant)

Question b.
Mango, banyan, palm, chickpea
Answer:
Chickpea (shrub, others are not)
or
Palm (tall tree without any branches, others have branches)

Question c.
Grape, orange, lemon, hibiscus
Answer:
Grape (only creeper, others are not)
or
Hibiscus (flower, others are fruits)

Question d.
Sunflower, banyan, jowar, bajra
Answer:
Banyan (perinnial, others are not)

Question e.
Guava, radish, carrot, beetroot
Answer:
Gauva (fruit, others are roots)

Question f.
Deer, fish, man, worms
Answer:
Worms (invertebrate, others are not)
or
Fish (aquatic animal, others are terristrial animals

3. What is the difference?

Question a.
Flowering plant and Non-flowering plant
Answer:

Flowering plant	Non-flowering plant
1. Plants that bear flowers are called flowering plants.	1. Plants that do not bear flowers are called non­flowering plants.
2. They have roots, stems and leaves.	2. They may not have roots, stems or leaves.
e.g. Rose, sunflower, lotus	e.g. Pine, fern, algae

Question b.
A Tree and a Shrub
Answer:

Tree	Shrub
1. They have branches at some height above the ground.	1. They give out branches close to the ground.
2. They grow very tall compared to shrubs.	2. They grow upto 2 to 3 metres in height.
3. They have strong and hard stems.	3. They have thick hard stems.
e.g. Mango tree, banyan tree	e.g. Hibiscus, oleander

Question c.
Vertebrates and Invertebrates
Answer:

Vertebrates	Invertebrates
1. They have vertebral column.	1. They do not have vertebral column.
2. The brain is well developed.	2. The brain if present may not be developed.
e.g. Human, dog, fishes etc.	e.g. earthworm, insects etc.

4. True or false?

Question a.
The snail is an aquatic animal.
Answer:
False

Question b.
Amphibians can live in air and in water.
Answer:
False

Question c.
The function of the brain is well developed in vertebrate.
Answer:
True

Question d.
The amoeba is a multicellular animal.
Answer:
False

5. Write two names of each. 

Question a.
A flowering plant
Answer:
Rose, hibiscus

Question b.
A non-flowering plant
Answer:
Fern, algae

Question c.
A tree
Answer:
Mango, banyan

Question d.
A shrub
Answer:
Oleander, hibiscus

Question e.
A creeper
Answer:
Pumpkin, watermelon

Question f.
An annual plant
Answer:
Jowar, sunflower

Question g.
A biennial plant
Answer:
Carrot, beetroot

Question h.
A perennial plant
Answer:
Mango, gulmohar

6. Write answers to the following. 

Question a.
What are the parts of a plant?
Answer:
The parts of a plant are: root, stem, leaves, flowers, fruit and seed.

Question b.
What are the functions of root?
Answer:
The functions of root are:

1. The root hold the soil firmly and anchor the plant.
2. They absorb water, salt and minerals from the soil and transport it to stem.
3. Some roots store food. e.g. Carrot, radish.

Question c.
Why is it necessary to classify living things?
Answer:

1. There is a great diversity in living things- both plants and animals on the earth.
2. In order to identify them and to study their characteristics, systematic classification is necessary.

Question d.
What are the criteria used to classify living things?
Answer:
Following are the criteria used to classify living things:
a. Plants:

• Mode of nutrition.
• Similarities and differences in structure.
• Presence of flowers or not.
• Period of life cycles.
• Habitat.

b. Animals:

• Cell structure.
• Presence of vertebral column.
• Method of reproduction.
• Habitat.

Question e.
Tell some characteristics of creepers.
Answer:
The characteristics of creepers are:

1. The stem of a creeper is very flexible, soft and green and need support to climb.
2. Some climbers spread on the ground, e.g. Pumpkin
3. Some have aerial roots, e.g. Money plant
4. Some climbers develop tendrils, e.g. Cucumber

Question f.
Explain the characteristics of herbs with examples.
Answer:

1. Herbs grow 1 to 1.5 m tall.
2. Their stem is green and quite flexible.
3. They may live for a few months or upto two years, e.g. Tulsi, oregano, etc.

Question g.
How is the body of animals protected?
Answer:
Body of animals are protected by special covering such as skins, feathers, scales, hair fur, etc.

Question h.
On the basis of which criteria will you classify plants and animals?
Answer:

7. Draw figures. 

Question a.
Draw the figure of a plant to show the parts, namely, the root, stem and leaves in it.
Answer:

Activity:

Question 1.
Visit a plant nursery and classify the plants there.

Question 2.
Visit a zoo and obtain information about the diversity in animals.

Question 3.
Write an essay on diversity in plants.

Question 4.
Collect seeds of various plants during summer and throw them in open spaces (fallow land, moorland, hill, etc.) during the rainy season.

Class 6 Science Chapter 3 Diversity in Living Things and their Classification Important Questions and Answers

Fill in the blanks:

Question 1.
Plants that can prepare their own food are called ………….. plants.
Answer:
autotrophic

Question 2.
Pitcher plants are ………….. .
Answer:
insectivorous

Question 3.
The ………….. is an important means of reproduction.
Answer:
flower

Question 4.
Animals that lay eggs are ………….. animals.
Answer:
oviparous

Question 5.
Animals that can live on land as well as water are called ………….. .
Answer:
amphibians

Choose the correct alternative:

Question 1.
The ………….. is a perennial.
(a) beetroot
(b) gulmohar
(c) grass
Answer:
(b) gulmohar

Question 2.
The sunflower is a / an ………….. plant.
(a) annual
(b) biennial
(c) perennial
Answer:
(a) annual

Question 3.
Cactus is a ………….. plant.
(a) land
(b) water
(c) desert
Answer:
(c) desert

Question 4.
The …………….. is a unicellular animal.
(a) cockroach
(b) snail
(c) paramoecium
Answer:
(c) paramoecium

Question 5.
Hen is a …………….. animal.
(a) oviparous
(b) viviparous
(c) none of above
Answer:
(b) oviparous

Question 6.
Earthworm is a / an ……………. animal.
(a) vertebrate
(b) invertebrate
(c) unicellular
Answer:
(b) invertebrate

True or False:

Question 1.
The pods of beans and peas are actually fruits.
Answer:
True

Question 2.
Fungus is heterotrophic.
Answer:
True

Write two names of each.

Question 1.
An invertebrate animal
Answer:
Earthworm, cockroach

Question 2.
An oviparous animal.
Answer:
Hen, sparrow

Distinguish between:

Question 1.
Autotrophic plant and Heterotrophic plant
Answer:

Autotrophic plant	Heterotrophic plant
1. They can produce their own food.	1. They cannot produce their own food. They depend on other things for their food.
2. They are green in colour.	2. They are non­green in colour.
e.g. Periwinkle, pomegranate etc.	e.g. Dodder, loranthus etc

Classify as directed.

Question 1.
Into annual, biennial, perennial
Sunflower, carrot, bajra, mango, jowar, oleander, beetroot, coconut
Answer:

Annual	Biennial	Perennial
Sunflower	Carrot	Mango
bajra	beetroot	oleander
jowar		coconut

Question 2.
Into vertebrates and invertebrates
Fish, cat, earthworm, snail, hen, cockroach
Answer:

Vertebrates	Invertebrates
Fish	Earthworm
cat	snail
hen	cockroach

Define. 

Class 6 Science Chapter 3 Diversity In Living Things and Their Classification Question 1.
Unicellular animal
Answer:
Animals which have a single cell body performing all functions, are called unicellular animals, e.g. Amoeba

Diversity In Living Things And Their Classification Exercise Question 2.
Multicellular animals
Answer:
Animals which have many cells in their body, are called multicellular animals, e.g. Cat

Diversity In Living Things and Their Classification Question 3.
Vertebrates
Answer:
Animals with vertebral column are called vertebrates, e.g. Man

Question 4.
Invertebrate animals
Answer:
Animals without vertebrate column are called invertebrate animals, e.g. Earthworm

Question 5.
Oviparous animals
Answer:
Animals which lay eggs and hatch them are called oviparous animals, e.g. Hen

Question 6.
Viviparous animals
Answer:
Animals which give birth to their young ones are called viviparous animals, e.g. Dog

Answer the following:

Question 1.
Give the functions of:
Answer:
a. Stem:
1. The stem gives support to the other parts of the plant.
2. The stem carries out the function of production, conduction and storage of the food.
3. In some cases it stores food.
b. Leaves: They play an important role in the production of food.
c. Flowers: The flowers are reproductive organ of plant.
d. Fruits: Fruits have seeds which give rise to new plant.
e. Seeds: From the seeds arise new plants.

Answer the following in short.

Question 1.
What type of plants are toolstools and mushrooms?
Answer:
Toolstools and mushrooms are heterotrophs.

Question 2.
What type of plant is a fig?
Answer:
Fig is a tree.

Question 3.
Do ferns, algae and money plant bear flowers?
Answer:
Ferns, algae and money plants do not bear flowers. They are non-flowering plants.

Question 4.
Which is the largest flower and where is it found?
Answer:
Rafflesia Arnoldi is the world’s largest flower. It is found in Indonesia.

Question 5.
Where does pomegranate grow?
Answer:
Pomegranate is a shrub which grows on land in soil.

Question 6.
Where do bulrushes and railroad creepers grow?
Answer:
Bulrushes is a water plant and railroad creepers grow along the ground.

Question 7.
Where does lotus grow?
Answer:
Lotus grows in water.

Question 8.
Where does the dodder plant grow?
Answer:
Dodder is a parasitic plant and grows on other plants.

Question 9.
Why does water hyacinth float?
Answer:
The stem of water hyacinth is filled with air and its leaves are specially modified, which helps it to float in water.

Question 10.
Why is the stem of a cactus plant fleshy?
Answer:
Cactus is a desert plant. As there is a shortage of water, cactus stores water in its stem and hence, stem of cactus is fleshy.

Question 11.
Which spheres of the earth do living things exist?
Answer:
Living things exists in all three spheres of earth, i.e. Atmosphere, lithosphere and hydrosphere.

Question 12.
Are the plants and animals that you have seen all alike?
Answer:
No. They are all of different types.

Question 13.
What are the similarities between a mango, a banyan and a tamarind tree?
Answer:
They are tall, big and perennial plants.

Question 14.
What are the similarities between the hibiscus, oleander and lantana plants?
Answer:
They are shorter and smaller than trees.

Question 15.
What are the similarities between fenugreek and periwinkle plants?
Answer:
They are smaller and shorter than trees and shrubs.

Question 16.
Have you seen vines like the pumpkin, the railroad creeper, kavali, watermelon or the grapvine? How do they grow?
Answer:
They have very soft, green and flexible stem. They grow with the help of a support.

Question 17.
For how many years do crops like bajra, wheat, corn, radish, marigold live?
Answer:
They live for about one year.

Question 18.
To which part of plants are butterflies and insects attracted?
Answer:
Butterflies and insects are attracted towards the flower of the plants.

Question 19.
What is the chain of bones in the centre of our back called?
Answer:
A vertibral column.

6th Std Science Questions And Answers:

• Natural Resources – Air, Water and Land Class 6 Questions And Answers
• The Living World  Class 6 Questions And Answers
• Diversity in Living Things and their Classification Class 6 Questions And Answers
• Disaster Management Class 6 Questions And Answers
• Substances in the Surroundings – Their States and Properties Class 6 Questions And Answers
• Substances in Daily Use Class 6 Questions And Answers
• Nutrition and Diet Class 6 Questions And Answers
• Our Skeletal System and the Skin Class 6 Questions And Answers
• Motion and Types of Motion
• Force and Types of Force Class 6 Questions And Answers

Balbharti Maharashtra State Board Class 6 Science Solutions Chapter 13 Sound Notes, Textbook Exercise Important Questions and Answers.

Std 6 Science Chapter 13 Sound Question Answer Maharashtra Board

Class 6 Science Chapter 13 Sound Question Answer Maharashtra Board

1. Fill in the blanks with the proper words.

Question a.
The propagation of sound does not occur through a ………….. .
Answer:
vacuum

Question b.
Noise pollution is a …………… issue.
Answer:
social/serious

Question c.
The sound which is disagreeable to our ears is called …………… .
Answer:
noise

Question d.
Noise has adverse effects on our …………….. .
Answer:
health

2. What should we do?

Question a.
The silencer of a motorcycle is broken.
Answer:

1. If the silencer of a motorcycle is broken, vehicle should be immediately taken to the garage for repair.
2. If silencer is not maintained properly, it will continue making loud noise on the road while in motion, resulting in increasing noise pollution.

Question b.
A factory in the surrounding is producing continuous loud noise.
Answer:
Factories should be located at a proper distance away from residential areas. Authorities should be contacted who will control the decibel level.

3. Write the answers in your own words.

Question a.
What is meant by vibration?
Answer:
Vibration of an object is necessary for the production of sound. As long as the object vibrates, the sound is heard. When the vibration stops, the sound also stops.

Question b.
Explain with the help of practical examples how sound is propagated through solids.

Answer:

1. Singing
2. Chirping of birds
3. Bursting of crackers
4. Whispering
5. Whistling
6. Flute
7. Honking
8. Dog barking

Question c.
What is meant by noise pollution?
Answer:
Continuous noise which has ill effects is called noise pollution.

Question d.
What measures will you take to control noise pollution?
Answer:
Measures for preventing noise pollution:

1. As far as possible, we should avoid blowing horns.
2. The volume of the TV or radio in the house should be restricted to those watching the programmes.
3. Vehicles should be maintained properly to reduce the unnecessary sounds they produce.
4. Factories, airports, railway stations and bus stands should be located at the proper distance away from residential area.
5. Planting of trees helps reduce noise as trees act as a natural barrier.

4. Complete the table.

Question a.

Answer:

Nature of sound	Unpleasant	Pleasant
1. Speaking		✓
2. Whispering		✓
3. Aeroplane Sounds	✓
4. Horns of Vehicles	✓
5. Railway Engine	✓
6. Rustling of leaves		✓
7. Neighing of a horse	✓
8. Ticking of a clock		✓

Project:

Question 1.
Prepare a list of the harsh sounds mheard near your house. Write about those sounds which produce noise pollution.

Question 2.
Collect information about places where loud noise is prohibited and discuss why it is so.

Class 6 Science Chapter 13 Sound Important Questions and Answers

Fill in the blanks:

Question 1.
Some sounds are ……………… and are heard easily.
Answer:
loud

Question 2.
Some sounds are very ……………… and cannot be heard unless we listen attentively.
Answer:
soft

Question 3.
As long as the object ……………… the sound is heard.
Answer:
vibrates

Question 4.
When the vibration ……………… the sound also stops.
Answer:
stops

Question 5.
The intensity of sound is measured in a unit called ……………… .
Answer:
decibels(dB)

Question 6.
The voice box is located in our ……………… .
Answer:
throat

Question 7.
Sound travels in the form of ……………… through air, water and ……………. .
Answer:
waves, solids

Question 8.
The sound is propagated more clearly through a ……………… than through air.
Answer:
solid

Question 9.
Transmission of sound occurs at a different ……………… through different mediums.
Answer:
speed

Question 10.
Continuous noise which may have ill effects, is called noise ……………… .
Answer:
pollution

Question 11.
Some of the sounds that we enjoy can be a ……………… for others.
Answer:
nuisance

Question 12.
The vibration of an object is necessary for the ……………… of sound.
Answer:
production

Answer in one sentence.

Question 1.
List characteristics of sound.
Answer:
Sounds are soft, loud, pleasant and unpleasant.

Question 2.
What do you mean by unpleasant sounds?
Answer:
The sounds by which we get annoyed are called unpleasant sounds.

Question 3.
What do you mean by loud and soft sounds?
Answer:
The sounds which are heard easily, are loud sounds and the sounds which cannot be heard unless we listen attentively, are soft sounds.

Question 4.
Which movement is exhibited by diaphragm of a speaker and a tabla?
Answer:
Diaphragm of a speaker and a tabla exhibit rapid oscillatory motion which gives rise to vibrations.

Question 6.
What is source of the sound?
Answer:
The object due to which sound is produced is called the source of the sound.

Question 7.
What is acoustics?
Answer:
The science of sound, resonance, production, propagation and effects of sound is called acoustics.

Question 8.
What produces sound in living beings?
Answer:
The vibration of the vocal chords in our larynx or voice box produces sound.

Question 9.
On what does quality of sound depend?
Answer:
Quality of sound produced in the larynx depends upon the tautness of the vocal chords.

Question 10.
How is sound propagated?
Answer:
The sound is propagated in the form of waves through air, water or through a solid.

Question 11.
Why is sound heard more clearly through solids?
Answer:
Transmission of sound occurs at a different speed through different mediums. Transmission of sound is faster through a solid than through a liquid and gas.

Question 12.
What is noise?
Answer:
A loud sound is harsh to ears. Such sounds produce noise.

Question 13.
List the effects of very loud or continuous noise on the people.
Answer:

1. Very loud or continuous noise can cause hearing impairment.
2. This can even lead to deafness.
3. It also causes restlessness, irritability and mental exhaustion.

Question 14.
What is noise pollution?
Answer:
Continuous noise which has ill effects is called noise pollution.

Question 15.
How can we prevent noise pollution with respect to watching TV?
Answer:
The volume of the TV or radio in the house should be restricted to those watching the programmes.

Explain the terms.

Question 1.
Propagation of sound:
Answer:
Sound is said to be propagated when sound waves spread in all directions from a source of sound.

Question 2.
Medium of propagation of sound:
Answer:
The substance around a source of sound through which sound waves spread is called the medium of propagation of sound.

Question 3.
Which sounds do you hear during the recess in the school?
Answer:
During the recess in the school, we hear.

1. laughing
2. students running
3. talking loudly
4. ringing of the bell
5. stamping on the staircase
6. shouting

Question 4.
When there is silence in the classroom, close your eyes and sit quietly. Which sounds in your surroundings can you hear now?
Answer:

1. Loud: Laughing, running, talking, horn of cars, marriage procession, school band, teacher’s voice in next classroom.
2. Pleasant: P.T. teacher’s whistle, chirping of birds.
3. Unpleasant: Shouting, bell ringing, stamping on staircase, dog barking, horns of vehicles.

Question 5.
When a song is being played on a radio or a music system in the house, place your hand on its speaker. What do you feel? Put off the music. What do you feel now?
Answer:

1. When a hand is placed on the speakers of the music system, we feel vibrations on the hand.
2. When music is put off, we don’t feel any vibrations on the hand.

Question 6.
When a metal dish falls on the floor; it makes a loud noise. What do we do to stop the noise? What is the effect of that action?
Answer:
To stop the noise of metal dish falling on the floor, quickly put hand on the dish. Vibrations of the metal dish are stopped and the noise stops.

Question 7.
What is it that vibrates when the sounds of sitar, bell, water tap, and breaking of a saucer, etc. are produced?
Answer:
Strings of the sitar, tongs of the bell, water drops hitting the floor of the basin, pieces of saucers that hit the ground vibrate to produce the sounds.

Question 8.
Take a pot full of water. Strike it lightly on the rim. What do you see? Why are waves formed on the water in the pot?
Answer:

1. We see ripples on the water.
2. When we strike the rim of the pot, our striking causes vibrations. These vibrations are transferred or moved from the pot to the water. Hence, water waves/ripples are seen on the water in the pot.

Question 9.
On rubbing balloon filled with water and another filled with air, of which balloon do we hear a clear or sound?
Answer:
We hear a clearer sound of the water balloon.

Question 10.
If a bell is rung in a vacuum container, will its sound be heard outside?
Answer:
Its sound will not be heard outside.

Observe and Discuss.

Observe the figure and answer the questions.

Question 1.
Which of these sounds is pleasant?
Answer:
The singing of the girl is a pleasant sound.

Question 2.
Which sound is a nuisance to people?
Answer:

1. Boy shouting/screaming.
2. Boy moving/ walking with a toy rattle.

Observe the figure and answer the following.

Question 1.
Make a list of all sounds implied in the picture.

Answer:

1. Chirping of bird outside the house on the tree.
2. Collision of two vehicles – honking of the vehicles.
3. Baby crying.
4. Father talking on the phone.
5. Brother playing in the house – jumping.
6. Sister playing the drum – hitting the drum.
7. Sound of TV.
8. Dog barking.
9. Mother talking to the neighbour.

Question 2.
How would this atmosphere affect a person who is not feeling well?
Answer:
This atmosphere is not convenient for a patient who is ill. He cannot take rest.

Question 3.
Would you be able to study in these conditions?
Answer:
No, students cannot study in this condition. They cannot concentrate on their study.

6th Std Science Questions And Answers:

• Work and Energy Class 6 Questions And Answers
• Simple Machines Class 6 Questions And Answers
• Sound Class 6 Questions And Answers
• Light and the Formation of Shadows Class 6 Questions And Answers
• Fun with Magnets Class 6 Questions And Answers
• The Universe Class 6 Questions And Answers

Balbharti Maharashtra State Board Class 6 Science Solutions Chapter 7 Nutrition and Diet Notes, Textbook Exercise Important Questions and Answers.

Std 6 Science Chapter 7 Nutrition and Diet Question Answer Maharashtra Board

Class 6 Science Chapter 7 Nutrition and Diet Question Answer Maharashtra Board

1. Fill in the blanks:

Question a.
The process of intake of food and utilizing it for all life processes is called ……………. .
Answer:
nutrition

Question b.
All the substances in our food which are useful for various body processes are called ………… .
Answer:
nutrients

Question c.
Carbohydrates and …………. provide …………… to our body.
Answer:
fats, energy

Question d.
In a balanced diet, all the nutrients are present in the ……………. proportion.
Answer:
right

Question e.
In the food pyramid, cereals are given the maximum space because they fulfill our …………… requirement.
Answer:
energy

Question f.
Intake of more food than necessary causes ………….. .
Answer:
overnutrition

2. Spot the following in the table of vitamins and minerals.

Question a.
The nutrient present in citrous fruits.
Answer:
Vitamin C

Question b.
Vitamins/minerals present in milk.
Answer:
Vitamin A, Vitamin B, Vitamin D, calcium, phosphorus.

Question c.
Causes and symptoms of night blindness, scurvy, rickets, beriberi.
Answer:

Diseases	Causes	Symptoms
1. Night blindness	Deficiency of Vitamin A	Inability to see in dim light
2. Scurvy	Deficiency of Vitamin C	Bleeding of gums
3. Rickets	Deficiency of Vitamin D	Softening of bones
4. Beri-beri	Deficiency of Vitamin B1	Nerve disorder, muscle weakness

Question d.
Foods required to prevent the above diseases.
Answer:

Diseases	*Causes	‘Symptoms	Food for prevention
1. Night blindness	Deficiency of Vitamin A	Inability to see in dim light	Carrots, milk, dark green vegetables.
2. Scurvy	Deficiency of Vitamin C	Bleeding of gums	Amla, kiwi, oranges and citrus fruits.
3. Rickets	Deficiency of Vitamin D	Softening of bones	Exposure to sunlight, milk, fish, egg, butter.
4. Beri-beri	Deficiency of Vitamin B1	Nerve disorder, muscle weakness	Milk, fish, meat, cereals, nuts, pulses

Question e.
Causes of anaemia.
Answer:
Deficiency of Vitamin B₁₂, iron.

Question f.
Essential mineral for healthy bones and teeth.
Answer:
Calcium, phosphorus.

Question g.
Sensory organ affected due to the deficiency of Vitamin A.
Answer:
Eyes, skin.

3. Choose the correct alternative. 

Question a.
Pulses are a very good source of ……………. .
(1) carbohydrates
(2) proteins
(3) fats
(4) minerals
Answer:
(2) proteins

Question b.
…………. provide maximum energy to our body.
(1) Cereals
(2) Leafy Vegetables
(3) Water
(4) Amla
Answer:
(1) Cereals

Question c.
Goitre is caused by the deficiency of ……….. .
(1) iron
(2) calcium
(3) iodine
(4) potassium
Answer:
(3) iodine

Question d.
……….. is a type of junk food.
(1) Orange
(2) Milk
(3) Bhakri
(4) Chocolate
Answer:
(4) Chocolate

4. Use the food pyramid to select food items of your choice for three days.
Conditions:
1. The diet for all three days should be balanced.
2. There should be variety in the items chosen for the three days.
Answer:

Day 1:
Cereal like cornflakes and milk, apple, roti, sabzi and dal.

Day 2:
Bread and butter with milk, rice/ roti and chicken, curd, any one type of fruit, salad.

Day 3:
Poha, green vegetable and dal with rice or roti, raita, one fruit, vegetable sandwich.

Activity:

Question 1.
Obtain information on simple methods of spotting the adulteration in foodstuffs and try them out.

Class 6 Science Chapter 7 Nutrition and Diet Important Questions and Answers

Choose the correct alternative:

Question 1.
Vitamin ……………. and vitamin …………….. dissolve easily in water.
(a) A, B
(b) B, C
(c) B, D
(d) B, E
Answer:
(b) B, C

Question 2.
……………. carries oxygen to all parts of the body.
(a) Calcium
(b) Iron
(c) Iodine
(d) Sodium?
Answer:
(b) Iron

Question 3.
Deficiency of vitamin ……………. causes excessive bleeding after an injury.
(a) A
(b) B
(c) K
(d) D
Answer:
(c) K

Question 4.
In accordance with the food pyramid, the proportion of ……………. should be least in our diet.
(a) cereals
(b) fruits
(c) milk
(d) oil
Answer:
(d) oil

Question 5.
……………. is a rich source of vitamin C.
(a) Carrot
(b) Amla
(c) Meat
(d) Milk
Answer:
(b) Amla

Question 6.
Children of growing age need to get approximately ……………. to ……………. calories from the food they eat.
(a) 1500-2000
(b) 3150-4150
(c) 2000-2500
(d) All of them
Answer:
(c) 2000-2500

Fill in the blanks:

Question 1.
All food that we consume during the day is together called our ………. .
Answer:
diet

Question 2.
………….. convert milk into yogurt.
Answer:
Probiotics.

Match the columns:

Question 1.

Column ‘A’	Column ‘B’
1. Carbohydrates	a. resistance to diseases
2. Proteins	b. energy
3. Fibre	c. growth
4. Vitamins	d. excretion

Answer:

Column ‘A’	Column ‘B’
1. Carbohydrates	b. energy
2. Proteins	c. growth
3. Fibre	d. excretion
4. Vitamins	a. resistance to diseases

Question 2.

Column ‘A’	Column ‘B’
1. Iron	a. Goitre
2. Calcium and phosphorous	b. Anaemia
3. Iodine	c. Inefficiency of muscles
4. Sodium and potassium	d. Weak bones

Answer:

Column ‘A’	Column ‘B’
1. Iron	b. Anaemia
2. Calcium and phosphorous	d. Weak bones
3. Iodine	a. Goitre
4. Sodium and potassium	c. Inefficiency of muscles

Question 3.

Column ‘A’	Column ‘B’
1. Vitamin A	a. Scurvy
2. Vitamin C	b. Excessive bleeding
3. Vitamin D	c. Skin disorders
4. Vitamin E	d. Nightblindness
5. Vitamin K	e. Rickets

Answer:

Column ‘A’	Column ‘B’
1. Vitamin A	d. Nightblindness
2. Vitamin C	a. Scurvy
3. Vitamin D	e. Rickets
4. Vitamin E	c. Skin disorders
5. Vitamin K	b. Excessive bleeding

Pick out the odd one:

Question 1.
Chocolate, chapatti, banana, milk
Answer:
Chocolate

Question 2.
Rice, chapatti, carrot, dal.
Answer:
Carrot

Question 3.
Scurvy, Rickets, Beriberi, Goitre.
Answer:
Goitre

Question 4.
Vitamin A, Vitamin C, Vitamin D, Vitamin E
Answer:
Vitamin C

Answer the following:

Question 1.
Why do living things need food and water?
Answer:
Living things take food and water and use them for:

1. Obtaining energy
2. Growth of the body
3. Carrying out day to day functions of the body.
4. Fighting against diseases

Question 2.
Name the main nutrients in our food.
Answer:
There are six main nutrients in our food. They are:

1. Carbohydrates
2. Fats
3. Proteins
4. Fibres
5. Vitamins
6. minerals

Question 3.
How do we get energy from the food?
Answer:

1. We get energy in the form of heat from the food we eat.
2. Heat is measured in kilocalories (calories).
3. Hence, the energy in food items is also measured in kilocalories (calories).

Question 4.
Vitamin C rich food should be eaten raw. Why?
Answer:

1. Vitamin C is very sensitive to heat and light.
2. It is destroyed easily during cooking. Hence, Vitamin C rich food should be eaten raw.

Question 5.
What is balanced diet? Give its significance.
Answer:
A diet containing adequate quantities of all nutrients is called as balanced diet. Significance of a balanced diet are:

1. An increased capacity to work.
2. Good physical and mental health.
3. Increased capacity to fight/resist diseases.
4. Helps in proper growth of the body.

Question 6.
What is obesity? How to avoid obesity?
Answer:

• Obesity is the state of being overweight.
• Junk food eaten frequently causes obesity.
• Obesity is not good for health.

To avoid obesity:

1. Have a balanced diet.
2. Eat whole grains, fruits and vegetables with their skins.
3. Increase use of bicycles.
4. Play more outdoor games.
5. Do not eat if you are not hungry.
6. Do not watch T.V while eating.
7. Avoid precooked, packaged food.
8. Exercise regularly.

Write short notes.

Question 1.
Vitamins:
Answer:
1. Vitamins are vital substances required by our body in small quantities. They help to improve the body’s resistance to diseases. Their deficiency can lead to various diseases, e.g.: deficiency of Vitamin A causes night blindness and that of Vitamin D causes rickets. The sources of vitamins are vegetables, fruits, milk, fish, meat etc.
2. There are two kinds of vitamins – water soluble vitamins and water insoluble vitamins.
3. Vitamin B and Vitamin C are water soluble vitamins because they dissolve easily in water. They are thrown out of the body through the water in sweat and urine. Hence, a regular supply of these vitamins is essential. B₁₇B₂, B₃, B₆, B₉, and Bp are the types of vitamin B.
4. Vitamins A, D, E and K are insoluble in water but are fat soluble vitamins. They get stored in the body.

Question 2.
Probiotics:
Answer:

1. The useful microorganisms which convert milk into yoghurt are present in yoghurt and buttermilk are called probiotics.
2. Lakhs of such useful microorganisms are present in our intestine.
3. They are essential for our health.
4. Hence, to maintain them in our body we should include food rich in probiotics in our daily diet.

Question 3.
Junk food:
Answer:

1. Foods which gives us energy but do not supply the necessary nutrients are called junk food.
2. Foods like chocolate, pizzas, burgers, noodles, fried foods like pakodas are junk food.
3. These foods contain refined flour, sugar and oil in large proportion.
4. If we consume these foods frequently, our body experiences shortage of proteins, vitamins and minerals.
5. This may lead to malnutrition and obesity.

Question 4.
Adulteration of food:
Answer:
To earn more profits, cheaper substances of low quality called adulterants, are mixed with the foodstuffs. The mixing adulterants to foodstuffs is called adulteration of food. Adulterants may be poisonous or harmful and such food is impure and unfit for consumption.
Some of the adulterants added to foodstuffs are given below:

Give scientific reasons:

Question 1.
Deficiency of vitamin B and C are common in our body.
Answer:

1. Vitamin B and vitamin C are water soluble vitamins.
2. They are thrown out of the body through the water in sweat and urine.
3. Hence, a regular supply of these vitamins is essential.
4. If we don’t intake food rich in these vitamins, deficiency occurs.

Question 2.
Exposure to sunlight is essential.
Answer:

1. On exposure to sunlight our body synthesizes Vitamin D from substances in milk, fish, eggs and butter.
2. Its deficiency causes softening of bones (Rickets).
3. Vitamin D helps in absorbing calcium and phosphorous for healthy bones and teeth.
4. Hence, exposure to sunlight is essential.

Complete the tables given below:

1.

Nutrients	Source	Function
1. Carbohydrates	Rice, chapatti	Provide energy
2. Fats	Oil, butter	Provide energy
3. Proteins	Sprouts, meat, eggs	Growth, repairing wear and tear of the body.
4. Vitamins	Vegetables, fruits	Improve body’s resistance to diseases
5. Fibre	Sprouts, vegetable, fruits	Help in excretion

2.

Mineral	Source	Function
1. Iron	Spinach, raisins	Carrying oxygen to all parts of the body
2. Calcium, phosphorous	Milk, milk products, meat	Strengthen bones and teeth
3. Iodine	Raisins, fish, sea fish	Controls growth, speeds up chemical reactions in the body.
4. Sodium and potassium	Salt, leafy vegetables, fruits, pulses	Maintain the body’s water balance and functioning of the muscles and nervous system.

3.

Vitamins	Source	Function
1. A	Carrot, milk, vegetables	Protects eyes, helps to keep skin, bones and teeth healthy.
2. B1	Milk, fish, cereals	Helps in proper function of nerves and heart.
3. B9	Deep green vegetables, papaya, kiwi	Growth of the body
4. B12	Meat, milk products	Formation of red blood cells
5. C	Amla, citrus fruits, green leafy vegetables	Protects body tissues
6. D	On exposure to sunlight, Vitamin D is made in our body	Formation of collagen – a protein essential for gums, teeth, bones and skin
7. E	Green  leafy vegetables, vegetable oil	Metabolism, reproduction
8. F	Green  leafy vegetables, sprouted pulses, yellow of egg	Helps in clotting of blood

Using the food items given below, prepare a balanced diet pyramid.
[Chapatti, banana, carrot, butter, Nan, egg, bread, cheese, dal, spinach, milk]
Answer:

Can you recall?

Question 1.
Which are the various groups of foodstuff? Which main constituents of food do we get?
Answer :
The various groups of foodstuffs are:

1. Milk and milk products, meat, fish, eggs.
2. Cereals and pulses
3. Vegetables and fruits.
4. Fatty substances oil, butter and ghee.

There are six main nutrients in our food: carbohydrates, fats, proteins, fibres, vitamins and minerals.

Nutrients	Foodstuffs
1. Carbohydrates	Cereals and pulses
2. Protein	Milk product, meat, fish, eggs
3. Fats	Butter, oil, ghee
4. Fibres	fruits and vegetables

Question 2.
What trouble do we have to face if we do not get enough fibre from our daily diet?
Answer:
Fibres help in excretion of food, if we do not get enough fibre we will face indigestion and stomach-ache.

Question 3.
What care must be taken to make sure that fibre is not lost or removed from the food we get?
Answer:
We must not over-cook the foodstuff containing fibres. Fruits should be eaten raw.

6th Std Science Questions And Answers:

• Natural Resources – Air, Water and Land Class 6 Questions And Answers
• The Living World  Class 6 Questions And Answers
• Diversity in Living Things and their Classification Class 6 Questions And Answers
• Disaster Management Class 6 Questions And Answers
• Substances in the Surroundings – Their States and Properties Class 6 Questions And Answers
• Substances in Daily Use Class 6 Questions And Answers
• Nutrition and Diet Class 6 Questions And Answers
• Our Skeletal System and the Skin Class 6 Questions And Answers
• Motion and Types of Motion
• Force and Types of Force Class 6 Questions And Answers

Balbharti Maharashtra State Board Class 6 Science Solutions Chapter 2 The Living World Notes, Textbook Exercise Important Questions and Answers.

Std 6 Science Chapter 2 The Living World Question Answer Maharashtra Board

Class 6 Science Chapter 2 The Living World Question Answer Maharashtra Board

1. Write the answers to the following questions in your words. 

Question a.
What are the differences between plants and animals?
Answer:

Plants	Animals
1. Plants cannot move from one place to another. They are anchored to the soil.	1. Animals can move from one place to another.
2. Plants prepare their own food with the help of chlorophyll and sunlight.	2. Animals cannot prepare their own food. They move in search of food from one place to another.
3. Plants grow throughout their life.	3. Animals grow only up to a certain period of their life.
4. Plants respire with the help of microscopic pores present on their leaves and stems.	4. Animals respire with the help of special organs like lungs, gills, trachea, etc.
5. Plants excrete their waste by storing them in the leaves and bark of plants and then shedding them seasonally.	5. Animals excrete their waste with the help of special organs regularly.
6. Plants are only living things which take in carbon dioxide and give out oxygen during photosynthesis.	6. Animals take in oxygen and give out carbon dioxide throughout their life.
7. Plants reproduce with the help of seeds, stems, spores, bulbs etc.	7. Animals reproduce by laying eggs or giving birth to young ones.

Question b.
What are the similarities between plants and animals?
Answer:

1. Both plants and animals increase in height, size and weight as they grow into an adult.
2. They require food to supply energy to carry out the various life processes.
3. They have a fixed life span after which they die.
4. All plants and animals respire and they take in oxygen and give out carbon dioxide while breathing.
5. All the plants and animals excrete their wastes produced in their body.
6. All plants and animals have ability to reproduce.
7. All plants and animals show responsiveness to their external stimuli.

Question c.
How is the plant kingdom useful to us?
Answer:

1. Plants are used for household as well as industrial purposes.
2. They provide us with food in the form of fruits, vegetables etc., e.g. Potato, methi, bhendi, apple, mango, etc.
3. Some plants are also used as medicines e.g. Adulsa, Hirada, Tulsi etc.
4. They also support birds which build their nests.
5. Wood of tress like oak, fir, birch, etc. are used to make furniture, in building homes, etc. Wood pulp is used to make paper.

Question d.
How is the animal kingdom useful to us?
Answer:

1. Dogs, cats, cows, etc. are domesticated. Dogs and cats are used as pets.
2. Cows, buffaloes, goats, etc. are used for getting their milk.
3. Sheep is used for obtaining wool.
4. Horses, oxen, camels and donkeys are used to carry burden and for various other occupations.
5. Earthworm is useful in agriculture.
6. Birds like hens, turkeys, and ducks provide their eggs to us for food.
7. Insects like bees provide us with honey, silkworm provides us with silk.

Question e.
What makes living things different from non-living things?
Answer:

Living Things	Non-Living Things
1. Living things can grow on their own in size, height and weight.	1. Non-living things do not grow on their own in size, height and weight.
2. Living things can move from one place to another on their own.	2. Non-living things can move only if someone moves them.
3. Living things can reproduce.	3. Non-living things cannot reproduce.
4. Living things exhibit responses to various stimuli.	4. Non-living things do not exhibit responses to various stimuli.
5. They require food for their growth.	5. They do not require any food.

2. What helps them to breathe?

Question a.
(a) A fish (b) A snake (c) A crane (d) An earthworm (e) Man (f) A banyantree (g) A caterpillar.
Answer:

Plant/Animal	Breathing Organ
A fish	gills
A snake	external nostrils and lungs.
A crane	external nose and air sacs in lungs.
An earthworm	moist skin.
Man	nose and lungs.
A banyan tree	microscopic pores (called stomata) present on leaves.
A caterpillar	trachea which opens at the side in their skin.

3. Fill in the blanks with the proper words from the brackets.
(plants, oxygen, dies, excretion, carbon- dioxide, photosynthesis, stimuli, cells, sunlight, chlorophyll, microscopic pores, responsiveness.)

Question a.
The process by which plants make their own food is called ……………… .
Answer:
photosynthesis

Question b.
To inhale …………. and to exhale ……………. is called respiration.
Answer:
oxygen, carbon-dioxide

Question c.
The elimination of waste substances fr6m the body is called ………….. .
Answer:
excretion

Question d.
The ability to respond to an event is called ……….. to ………… .
Answer:
responsiveness, stimuli

Question e.
On completing their lifespan, every living thing ………….. .
Answer:
dies

4. Write the uses of these animals and plants.
Animals: Honeybees, sharks, yaks, sheep, earthworms, dogs, bivalves, horses, mice.
Plants: Ginger, mango, eucalyptus, babul (acacia), teak, spinach, aloevera, turmeric, holy basil, karanja, moh, mulberry, grapevine.

Question a.
Write the uses of these animals and plants.
Answer:

Animals Uses:

Animals	Uses
1. Honeybees	Honey and wax prepared by them is used by us. Beeswax is used in cosmetics like lip – balm, lipgloss, etc.
2. Sharks	The ‘shark liver oil’ obtained from them is a rich source of vitamins.
3. Yaks	Milk and meat obtained is used as food. Yaks are also used for carrying loads in mountainous regions.
4. Sheep	Their fleece is used as a good source of wool. Their meat is used as food.
5. Earthworms	They convert biodegradable waste to good manure (vermicompost)which can be used in fields and gardens. They are called “friends of farmers” as they make the soil fertile.
6. Dogs	They are used as pets to guard houses and farms.
7. Bivalves	Bivalves like oysters are used to obtain pearls used in jewellery making. They are also used as food.
8. Horses	They are used for pulling carriages, heavy loads and also as means of transport in mountainous regions.
9. Mice	They are used in research to test medicines, vaccines etc.
10. Rabbits	They are used as pets and also in research. Their meat is used as food.

Plants Uses:

Plants	Uses
1. Ginger	Used as medicine to cure digestive problems of stomach. It is also used as a spice in food.
2. Mango	It is used to prepare pickles when raw and as a fruit when ripe. It is also used to prepare jam, jelly and in ice-creams.
3. Eucalyptus	Leaves and oil extracted from it is used as medicine to cure fever, cold and cough.
4. Babul (Acacia)	It is used as a medicine. Also used as cattle feed. It is used to clean teeth. It was also used to cure leprosy and heal wounds.
5. Teak (Sag)	Its wood is used to make furniture.
6. Spinach (Palak)	It is used as a vegetable.
7. Aloe vera (Korphad)	It is used to treat various skin diseases. Its gel is used as a moisturizer for skin and for treating hair fall.
8. Turmeric	It is used as a spice and has medicinal properties. It is used for healing wounds and cuts due to its antiseptic properties (i.e. helps to prevent growth of bacteria).
9. Holy basil (Tulsi)	It is used as medicine to cure cough and cold. It also reduces air pollution and drives away mosquitoes.
10. Karanja (Jatropha)	It is used as a medicine and its seeds are used to prepare biodiesel.
11. Moh (Mahwa) [Scientific name: Madhuca longifolia]	The fat extracted from its seeds is used in the manufacture of soaps and detergents. Its bark and flowers are used as medicine. Its leaves are used to feed silkworms which produce Tussar silk. Seeds and flowers are also used to make wine.
12. Mulberry	The leaves of these trees are used for feeding silkworms which produce silk. The fruits are rich in vitamins. Jam and jelly are also made from these fruits.
13. Grapevine	Grapes are fruits of a grapevine. They are used for making jam, jelly, juice, wine and are also eaten as fruits. Raisins are prepared from these grapes.

5. What are the peculiarities of the movements of these living things?
Living things : Snakes, tortoises, kangaroos, eagles, chameleons, frogs, gulmohur, sweet potato creeper, dolphins, ants, rattlesnakes, grasshoppers, earthworms.

Question a.
What are the peculiarities of the movements of these living things?
Answer:

1. Snakes	They don’t have legs. They move in a S-shaped wavy motion. They cannot move over smooth surface. They move by contraction and relaxation of their body muscles.
2. Tortoises	They are very slow and they walk on their four legs by raising their body off the ground. They are the slowest animals.
3. Kangaroos	The hind legs of kangaroos are long and front legs are short. A kangaroo moves by hopping (jumping) on its muscular hind legs with the support of long tail outstretched behind. This movement is called penta pedal movement [Penta = 5, pedal = legs].
4. Eagles	Eagles fly at great heights and they can lift and fly away with prey which are heavier than them. Wings of eagles are strong and powerful.
5. Chameleons	Chameleons can change the colour of their skin and camouflage (hide) in their surroundings. They move slowly with their four legs. They also use their tail and claws to grab a branch and balance themselves.
6. Frogs	Their hind legs are long and front legs are short. Hence, they hop on their hind legs, when on land, and swim with the help of hind limbs when in water.
7. Gulmohar	Gulmohar blooms in summer and the flowers which are red in colour reveal very few leaves. Their leaves fold up during evening. It grows to a height of 5 m to 12 m and it shed all its leaves in dry season.
8. Sweet potato creeper	Sweet potato creepers are fastest growing creepers that cover the whole ground. If they find some support, they try to bend towards it.
9. Dolphins	They move on surface of water by slapping their tail, exposing their head, leaping out of water, diving in the water and doing a side flop. 30 patterns are seen in their behaviour while moving on water.
10. Ants	The ants move in a line and as they move, they leave a chemical called pheromone behind as a trail which attracts other ants. They have six legs and they can walk very fast.
11. Rattle snakes	Rattle snake is a highly poisonous snake. The rattling sound is made by the shaking of the rattle located on its tail when it moves.
12. Grasshoppers	They are insects with three pairs of walking legs and two pairs of wings which helps them to walk, fly and jump. They can leap vigorously due to powerful hind legs.
13. Earthworms	Each segment on the body of earthworm contain group of bristles (called setae) which are used for movement. They move forward by repeated contractions and relaxations of their muscles. A slimy substances secreted by the earthworm helps in its movement.

6. Write in detail about how the plants and animals found in your surroundings prove useful or harmful.

Question a.
Write in detail about how the plants and animals found in your surroundings prove useful or harmful.
Answer:
Some animals and plants around us are harmful to man.

1. Mosquitoes and flies spread diseases.
2. Cockroaches, mice, rats destroy our food. Lice, ticks also spread diseases.
3. The bites of some poisonous lizards, spiders, snakes and scorpions can even cause death.
4. If wild elephants enter human settlements, they cause a lot of destruction.
5. Dog bite from a rabid dog can cause rabies.
6. Plants like datura are poisonous. Consumption of its seed can cause death.
7. Uncontrolled growth of algae and fungi pollutes water and may cause disease. Fungi cause rotting of food.
8. Pods of nettle and colocasia leaves can cause itching.
9. Weeds like parthemum, dodder affect crop growth.

Activity:

Class 6 Science Chapter 2 The Living World Question Answer Question 1.
Obtain information about the work of the Botanical Survey of India and the Zoological Survey of India by visiting the websites :
www.bsi.gov.in, W.zsi.gov.in

Class 6 Science Chapter 2 The Living World Question 2.
Collect information about the lifespan of various animals, make a chart and display it in your class.

The Living World Class 6 Questions And Answers Question 3.
Gather information about the poisonous snakes found in India and present it in a Science Exhibition.

Class 6 Science Chapter 2 The Living World Important Questions and Answers

Fill in the blanks with the proper words from the brackets.
(plants, cells, sunlight, chlorophyll, microscopic pores.)

The Living World Class 6 Question Answers Question 1.
Living things are made up of small units called ……….. .
Answer:
cells

The Living World Class 6 Question 2.
A potted plant placed in a window grows towards ………… .
Answer:
sunlight

The Living World Class 6 Solutions Question 3.
Plants appear green in colour due to the presence of ………… .
Answer:
chlorophyll

The Living World Class 6 Exercise Answers Question 4.
Plants respire by means of ………….. on their stems and leaves.
Answer:
microscopic pores

My Living World Book Class 6 Answers Question 5.
……………….. grow throughout their lifespan.
Answer:
Plants

Match the columns:

Question 1.

Column ‘A’	Column ‘B’
1. Responsiveness to stimuli	a. plants shed leaves in Autumn
2. Respiration	b. seeds sprout when sowed in soil
3. Excretion	c. petals of lotus close when sun sets
4. Reproduction	d. oxygen is taken in through moist skin in earthworms.

Answer:

Column ‘A’	Column ‘B’
1. Responsiveness to stimuli	c. petals of lotus close when sunsets
2. Respiration	d. oxygen is taken in through moist skin in earthworms.
3. Excretion	a. plants shed leaves in Autumn
4. Reproduction	b. seeds sprout when sowed in soil

Plants carry out photosynthesis to prepare their food. With reference to this process of photosynthesis, match the columns given below.

Question 1.

Column ‘A’	Column ‘B’
1. Minerals	a. given out into the air
2. Carbon dioxide	b. absorbed from the soil
3. Heat from sunlight	c. absorbed from the air
4. Oxygen	d. absorbed by chlorophyll.

Answer:

Column ‘A’	Column ‘B’
1. Minerals	b. absorbed from the soil
2. Carbon dioxide	c. absorbed from the air
3. Heat from sunlight	d. absorbed by chlorophyll.
4. Oxygen	a. given out into the air

Can you tell?

Question 1.
What differences do you see between the young ones and the adults in the picture?
Answer:

Answer:
The young ones are smaller in size, height and shape.

Question 2.
What do we learn from these pictures?

Answer:
We learn that all living beings whether plants or animals reproduce in different ways.

Question 3.
Observe a honeycomb and a wall. What are they made up of?
Answer:
Bricks are laid one over the other to form a wall. In a honeycomb, the beeswax is joined to form small compartments to form a honeycomb.

Question 4.
In what ways are the plants and animals useful to us?
Answer:

Plants	Animals
1. Plants cannot move from one place to another. They are anchored to the soil.	1. Animals can move from one place to another.
2. Plants prepare their own food with the help of chlorophyll and sunlight.	2. Animals cannot prepare their own food. They move in search of food from one place to another.
3. Plants grow throughout their life.	3. Animals grow only up to a certain period of their life.
4. Plants respire with the help of microscopic pores present on their leaves and stems.	4. Animals respire with the help of special organs like lungs, gills, trachea, etc.
5. Plants excrete their waste by storing them in the leaves and bark of plants and then shedding them seasonally.	5. Animals excrete their waste with the help of special organs regularly.
6. Plants are only living things which take in carbon dioxide and give out oxygen during photosynthesis.	6. Animals take in oxygen and give out carbon dioxide throughout their life.
7. Plants reproduce with the help of seeds, stems, spores, bulbs etc.	7. Animals reproduce by laying eggs or giving birth to young ones.

Use your brainpower!

Question 1.
What differences do you see in the growth of trees like mango, banyan and peepal and that of bamboo, coconut and toddy palms?
Answer:

1. Trees like mango, banyan and peepal have lot of branches and leaves.
2. They have a thick and wide trunk which is short.
3. Trees like bamboo, coconut and toddy palm have few leaves and they are found only at the top of the trunk.
4. The trunk of the tree is tall and comparatively thin.

Question 2.
In each of the examples given below, what is the stimulus? What is the response?

Answer:

1. In mimosa plant, touching the leaf is the stimulus and closing of mimosa leaves is the response.
2. Keeping the potted plant near the window is the stimulus and growing the stem in the direction of sunlight is the response.

Question 3.
What is the main difference between movements of plants and animals?
Answer:

1. Movement in plants is restricted i.e branches can bend towards light.
2. They swing to and fro when the wind blows.
3. The leaves open or close during the day and night, petals of flowers close or open during night and day.
4. Roots grow in the direction of water under the ground.?
5. Animals can freely move from one place to another in search of food, habitat and shelter.

Question 4.
Why have so many plants and animals been able to survive on the earth even today?
Answer:

1. All the animals and plants have ability to reproduce young ones similar to themselves.
2. Also they have ability to adjust themselves to the conditions in their surroundings.
3. Due to this ability we have so many types of plants and animals and they have been able to survive on the earth even today.

Question 5.
What is the sticky substance seen on the stems of the babul (acacia) or drumstick trees?
Answer:

1. It is the gum which oozes out when we prick it or cut it.
2. It is the waste product that is stored in the bark.
3. This gum has a lot of medicinal value.

Observe and discuss.

Question 1.
Hold your hand in front of your nose or keep your hand on your chest. What do you feel?

Answer:

Living Things	Non-Living Things
1. boy, girl, hen, dog, tree.	1. ball, book, fan, house, bucket, kite.

Find the life span and age of maturity of the given living beings.

Question 1.
Find the life span and age of maturity of the given living beings.
Answer:

Plants/Animals	Life span	Maturity age (Time period required to grow into adults and reproduce)
Dog	10 -15 years	2-3 years
Cow	15 years	2 years
Hen/Chicken	6-8 years	6 months
Elephants	40-60 years	10-15 years
Tortoise	More than 100 years	10-13 years
Butterfly	2-6 weeks	1 week
Mango tree	25 years	3-4 years
Peepal tree	150 years	3-4 years
Banyan tree	200-1000 years	5-6 years
Banana	25 years	3-4 years
Rice	3-4 months	1-2 months
Rose	5-7 years	1 year

Answer the following:

Question 1.
Is all the food we eat used by the body?
Answer:
No, non-essential and undigested food is thrown out of the body in the form of waste.

Question 2.
What is the unused part of food converted into?
Answer:
The unused part of food is converted into excreta.

6th Std Science Questions And Answers:

• Natural Resources – Air, Water and Land Class 6 Questions And Answers
• The Living World  Class 6 Questions And Answers
• Diversity in Living Things and their Classification Class 6 Questions And Answers
• Disaster Management Class 6 Questions And Answers
• Substances in the Surroundings – Their States and Properties Class 6 Questions And Answers
• Substances in Daily Use Class 6 Questions And Answers
• Nutrition and Diet Class 6 Questions And Answers
• Our Skeletal System and the Skin Class 6 Questions And Answers
• Motion and Types of Motion
• Force and Types of Force Class 6 Questions And Answers

Balbharti Maharashtra State Board Class 6 Science Solutions Chapter 11 Work and Energy Notes, Textbook Exercise Important Questions and Answers.

Std 6 Science Chapter 11 Work and Energy Question Answer Maharashtra Board

Class 6 Science Chapter 11 Work and Energy Question Answer Maharashtra Board

1. Fill in each blank with the appropriate term from the brackets.

Question a.
A bucketful of water is to be drawn from a well ………. will be done when a ………… is applied to do this, because there will be an ……………. of water.
(displacement, workforce)
Answer:
work, force, displacement

Question b.
If a ball is dropped on the sloping roof of a house, it acquires ……………. and falls on the ground. That is transformation of ………… energy into ……….. energy takes place.
(kinetic, potential, motion)
Answer:
motion, kinetic, potential

Question c.
You might have seen some beautiful fireworks during Diwali. It is an example of transformation of ……….. energy into ………………. energy.
(light, atom, chemical, solar)
Answer:
chemical, light

Question d.
The solar cooker is an application of the ………… energy of the sun, while solar cells, solar lamps are applications of the ………….. energy of the sun.
(light, chemical, heat)
Answer:
heat, light

Question e.
One labourer carried four pans of road metal through a distance of 100 metres. If he carries two pans of road metal through a 200 metre distance …………. work will be done.
(equal, more, less)
Answer:
equal

Question f.
The capacity that an object has for doing work is called ………… .
(energy, displacement, force)
Answer:
energy

2. Match the pairs.

Question a.

Column ‘A’	Column ‘B’
1. Rolling object	a. Heat energy
2. Food	b. Atomic energy
3. Stretched bow	c. Kinetic energy
4. Sunlight	d. Potential energy
5. Uranium	e. Chemical energy

Answer:

Column ‘A’	Column ‘B’
1. Rolling object	c. Kinetic energy
2. Food	e. Chemical energy
3. Stretched bow	d. Potential energy
4. Sunlight	a. Heat energy
5. Uranium	b. Atomic energy

3. Can you tell?

Question a.
When can we say that displacement has taken place?
Answer:
When the position of an object changes, we say that the object is displaced.

Question b.
What are the various forms of energy?
Answer:
Various forms of energy are: mechanical energy, heat energy, light energy, sound energy, chemical energy and electrical energy.

Question c.
Describe the natural chain of transformation of energy.
Answer:

1. In the course of water cycle, water evaporates due to the heat of the sun.
2. This water vapour forms clouds that give rain.
3. Rainwater flows into rivers and is stored in reservoirs or dams.
4. This stored water at a height has potential energy.
5. As the water falls down, this is transformed into kinetic energy.
6. When the water falls on the turbine, its kinetic energy is transferred to turbine.
7. The turbine rotates producing electrical energy.

Question d.
What should be taken into account for measuring work?
Answer:
For measuring work both force and displacement must be taken into account.

Question e.
Why should we save energy?
Answer:
Due to increasing population and increasing use of energy resources, there is a danger that limited reserves of coal, petrol, etc. will get exhausted. Hence, we should save energy for future generation.

Question f.
What is ‘green energy’?
Answer:
The energy resources which do not produce smoke and carbon gases such as carbon dioxide or carbon monoxide are called ‘green energy resources’. Energy from them is called green energy.

Question g.
What are the non-conventional energy resources?
Answer:
The resources that:

1. have not been used traditionally.
2. are inexhaustible and continuous.
3. That can be used in various forms again and again are called non-conventional energy resources.
4. e.g.: solar energy, wind energy, tidal energy, hydal power.

Question h.
Which forms of energy from the sun is used in solar energy devices?
Answer:

1. Heat energy from the sun is used in solar cookers, solar water heaters, solar driers.
2. Light energy from the sun is used in solar cells, solar panels.
3. Solar electric plants have the capacity to produce electricity on large scale.

Question i.
Why should we maximize the use of non- ntional energy sources?
Answer:

1. Due to increase in population there is increasing use of conventional sources like petrol, coal, etc. Their reserves are limited and they may get exhausted.
2. Hence, it will be better to use non- conventional sources of energy to save conventional resources for future.

4. Who is the odd-one-out?

Class 6 Science Chapter 11 Work And Energy Question 1.
Diesel, crude oil, natural gas, wind.
Answer:
wind

Work And Energy Class 6 Maharashtra Board Question 2.
A running car, hauling a log, a book kept on a table, picking up the school bag.
Answer:
A book kept on table.

Work And Energy Class 6 Question 3.
Sunlight, wind, wave, petrol.
Answer:
Petrol.

11 Work And Energy Class 6 Question 4.
Leaving the fan on in a vacant room, leaving the TV on while working, using A.C during winter, putting off the light when going out.
Answer:
putting off the light when going out.

5. Find out the types of energy from the following puzzle.

Question a.
Find out the types of energy from the following puzzle.

Answer:
Potential, Kinetic, Solar, Wind, Sound, Light, Heat

Activity:

Work And Energy Exercise Class 6 Question 1.
How can you save energy at home and in school? Discuss this with your friends and list all such measures. Put them into practice.

Work And Energy Class 6 Questions Answers Question 2.
Find out about energy saving devices available in the market.

Class 6 Science Chapter 11 Work and Energy Important Questions and Answers

Fill in the blanks with suitable words.

Work And Energy Class 6 Exercise Question 1.
Falling water possesses ………………… energy.
(potential, kinetic, chemical)
Answer:
kinetic

Work And Energy Class 6 Questions And Answers Question 2.
Heat is measured in unit called ……………….. .
(kilometres, kilogram, calorie)
Answer:
calorie

Class 6 Science Chapter 11 Question 3.
Plant stores the food in the form of ……………….. energy.
(mechanical, light, chemical)
Answer:
chemical

11. Work And Energy Class 6 Question 4.
We should use ……………….. energy resources with care.
(conventional, non-conventional, both)
Answer:
conventional

Match the columns:

Question 1.

Column ‘A’	Column ‘B’
1. Solar energy	a. Waves
2. Tidal energy	b. Home cooking
3. Natural gas	c. Car
4. Petrol	d. Solar water heater

Answer:

Column ‘A’	Column ‘B’
1. Solar energy	d. Solar water heater
2. Tidal energy	a. Waves
3. Natural gas	b. Home cooking
4. Petrol	c. Car

Can you tell?

6th Science Work And Energy Question 1.
Water in dams or reservoirs shows potential energy.
Answer:
Rainwater flows into river and is stored in reservoirs on dams. These are at height and therefore, their water has potential energy.

Class 6 Science Chapter 11 Question Answer Question 2.
The sun is the most important source of all energy.
Answer:
All forms of energy are utilizing indirectly solar energy in all transformation of energy. Therefore, the sun is the most important source of all energy.

Question 3.
What is tidal energy?
Answer:
A wall is constructed at a narrow region of a creek. Due to waves generated by high and low tides, the turbine of the generator fitted in the wall starts rotating and electricity is generated.

Use your brain power!

Question 1.
Why do you get hungry after physical exercise?
Answer:

1. When we do physical exercise we use the energy stored in the body.
2. To replenish this energy, we have to eat. Hence we feel hungry.

Question 2.
From where does our body get energy.
Answer:
Our body gets energy from the food we eat.

Question 3.
Why do we get tired?
Answer:
When we do any work, we use the energy. If this energy level becomes very low, then we feel tired.

Question 4.
What is the unit of work and energy?
Answer:
The unit of work and energy in SI (System International) is ‘Joule’.

Question 5.
If no displacement occurs on applying a force, what does it indicate?
Answer:
If no displacement occurs, then no work is said to be performed.

Can you tell?

Question 1.
In the game of marbles, from where does one marble get energy to set another marble in motion?
Answer:
When we apply physical force to the fast marble, it gains some force and when it strikes the second marble, energy in the form of force is transferred to the second marble and this force sets the second marble in motion.

Question 2.
While playing carrom from where does the striker gets the energy to make the pieces move?
Answer:
When we strike the striker, the force exerted by our muscles is transferred to the striker. When the striker strikes the coin, this energy is transferred to the coin which may help to pocket the coin.

Question 3.
What will happen as result of the action in the picture?

Question i.
The rubber band is released after streaching it.
Answer:
It comes back to its orriginal position.

Question ii.
A stone is held in the rubber of a catapult, the rubber is stretched and released.
Answer:
Stone gets thrown to a distance and rubber band cones back to its original position.

Let’s try this.

Question 1.
If we hold a convex lens over a sheet of paper in sunlight such that there is tiny spot of light on the paper for a while. What happens? Why?
Answer:

1. If a convex lens is held over a paper in sunlight such that there is a tiny spot of light on the paper for a while the paper bums.
2. This is due to the heat energy of the sun concentrated at a point due to the convex lens.

Question 2.
How does a picture appear on the screen of a TV?
Answer:
When a TV is switched on, the electrical energy is converted into light and sound energy. Hence, a picture appears on TV.

Question 3.
In which form is energy stored in plant food?
Answer:
Energy stored in plant food is in the form of chemical energy.

Question 4.
How is energy obtained from cooking gas?
Answer:
Energy obtained from cooking gas is heat energy which is obtained by conversion of chemical energy.

Question 5.
Why is Energy not visible to us?
Answer:
Energy is the capacity to do work. Energy is converted from one form to another in the form of work being done. Hence it is not visible to us.

How are we different from each other?

Question 1.
Potential energy and Kinetic energy
Answer:

Potential energy	Kinetic energy
1. Energy stored in an object due to its position is called potential energy.	1. Energy possessed by a body due to its motion is called kinetic energy.
2. No work is performed.	2. Work is performed.

Question 2.
Work and energy
Answer:

Work	Energy
1. When an object is displaced by applying force on it, work is said to be done.	1. Energy is the capacity to do work.
2. Work is done as a result of using energy.	2. Energy is the cause for work to be done.

Question 3.
Conventional and Non-conventional energy sources
Answer:

Conventional source of energy	Non-Conventional source of energy
1. Man has been using these energy resources for centuries.	1. These resources have not been used traditionally.

Classify as directed:

Question 1.
Into kinetic and potential energy
Waterfalls, water in a reservoir, a stretched spring, a boy running in a race.
Answer:

• Potential – water in a reservoir, a stretched spring.
• Kinetic – waterfalls, a boy running in a race.

Question 2.
Into conventional and non-conventional energy sources.
Tidal energy, diesel, cooking gas, coal, hydropower, solar energy.
Answer:

• Conventional energy sources – diesel, cooking gas, coal.
• Non-conventional energy sources – tidal energy, hydropower, solar energy.

Question 3.
Into different forms of energy

1. rubber band is released
2. cooking food
3. switching on fan
4. a battery
5. radio
6. TV

Answer:

1. Mechanical energy
2. Heat energy
3. Mechanical energy, electrical energy
4. Chemical energy
5. Sound energy
6. Light and sound energy

Define:

Question 1.
Work
Answer:
When an object is displaced by applying a force on it, work is said to be done.

Question 2.
Energy
Answer:
Energy is the capacity to do work.

Question 3.
Chemical energy
Answer:
The energy obtained through chemical action is called chemical energy.

Question 4.
Potential energy
Answer:
The energy which is stored in an object due to a specific state or position of that object is called potential energy.

Question 5.
Kinetic energy
Answer:
The energy obtained by the virtue of its motion is called kinetic energy.

Question 6.
Solar energy
Answer:
The enormous and continuous energy obtained from the sun is called solar energy. Solar energy is at the root of all energy available on earth.

Question 7.
Conventional energy resources: (non-renewable energy sources)
Answer:
The energy sources which man has been using for centuries and that cannot be replenished are called conventional energy sources.

Question 8.
Renewable energy sources: (non – conventional energy sources)
Answer:
The resources that have not been used traditionally and that are inexhaustible, continuous and can be used in various forms again and again are called renewable energy sources.

Explain – why?

Question 1.
Energy is not visible to us.
Answer:
There is energy in every substance in the universe. It is present in non-living as well as living things. But still we can only feel the energy when some work is done, e.g. When wind blows, we can feel the coolness in air. When we switch on the light in a dark room, we can see things due to light energy.

Question 2.
Save energy, (use alternative energy sources)
Answer:

1. Due to increasing population, there is increasing usage of energy resources.
2. There is a danger that limited reserves of conventional resources like diesel, crude oil, may get exhausted.
3. We should save energy so that future availability is ensured.
4. It will be better to use alternative and supplementary energy sources.

Question 3.
Methods of saving energy.
Answer:

1. Saving energy is as good as generating energy.
2. There are several ways of saving energy such as putting off lamps when not needed.
3. Making maximum use of sunlight.
4. Saving energy and energy resources is absolutely necessary. Otherwise, we will have to face the serious calamity like global warming.

Question 4.
State the energy conversions in following cases.

1. Solar water heater
2. Solar cell
3. Fission of uranium, thorium
4. Switch on mixer
5. Switch on lamp
6. Switch on TV
7. Switch on radio
8. Ram plays tabla
9. Ravi plays shehnai
10. You switch on the torch
11. Your mother lights the gas stove to cook
12. Dinesh is bursting crackers during Diwali

Answer:

1. Solar energy to heat energy
2. Solar energy to electrical energy
3. Atomic energy to heat energy and then to electrical energy
4. Electrical energy to mechanical energy
5. Electrical energy to light energy
6. Electrical energy to light energy and sound energy
7. Electrical energy to sound energy,
8. Mechanical energy to sound energy
9. Wind energy to sound energy
10. Chemical energy to light energy
11. Chemical energy to heat energy
12. Chemical energy to heat, light and sound energy

Observe the figure below and answer the question given.

Question i.
In the above activity, which are the different forces acting on the box?
Answer:
In the above activity, muscular force, frictional force and gravitational force act on the box.

Question ii.
Is displacement possible without force?
Answer:
No, force has to be applied in order to displace the box.

Question iii.
If force is applied to both the boxes is same, which box will be displaced more?
Answer:
If force applied to both the boxes is same, then empty box will be displaced more than box with books.

Question iv.
If me e books are added to box, and same force is applied, will the displacement be more or less?
Answer:
If the same force is applied for a heavier load then the displacement will be less.

Question v.a.
If a force is applied with both the hands on a wall, will there be a displacement?
Answer:
Whatever be the amount of force applied, the wall will not be displaced.

Question b.
If no displacement occurs on applying as force, what does it indicate?
Answer:
If no displacement occurs, then no work is said to be performed.

6th Std Science Questions And Answers:

• Work and Energy Class 6 Questions And Answers
• Simple Machines Class 6 Questions And Answers
• Sound Class 6 Questions And Answers
• Light and the Formation of Shadows Class 6 Questions And Answers
• Fun with Magnets Class 6 Questions And Answers
• The Universe Class 6 Questions And Answers

Balbharti Maharashtra State Board Class 6 Science Solutions Chapter 1 Natural Resources – Air, Water and Land Notes, Textbook Exercise Important Questions and Answers.

Std 6 Science Chapter 1 Natural Resources – Air, Water and Land Question Answer Maharashtra Board

Class 6 Science Chapter 1 Natural Resources – Air, Water and Land Question Answer Maharashtra Board

1. Fill in the blanks and rewrite the completed statements.

Question a.
The layer of ozone gas absorbs ……………. rays that come from the sun to the earth.
Answer:
Ultraviolet (U.V) rays

Question b.
Of the total water available on the earth, fresh water forms ……….. percent.
Answer:
0.3 %

Question c.
Both …………. and ………… constituents are present in the soil.
Answer:
biotic, abiotic

2. why is it said that?

Question a.
The ozone layer is a protective shell of earth.
Answer:

1. The ultra violet (UV) rays coming from the sun are very harmful for living things.
2. The ozone layer present in the lower stratosphere absorb this U.V. rays and prevent them from reaching the earth. As a result life on earth is protected.
3. Therefore, it is said that the ozone layer is a protective shell of the earth.

Question 2.
Water is life.
Answer:

1. Water is a good solvent and it dissolves many substances.
2. The human blood is made of 70% water and the sap of plant also contains a very high proportion of water.
3. All the life processes would not take place in the absence of water.
4. Hence, without water no living organism can survive.
5. Therefore, it is said that ‘water is life’.

Question c.
Sea water is useful even though it is not potable.
OR
In what way is sea water useful even though it is salty?
Answer:

1. Many fish and aquatic animals live in sea water.
2. The water from the sea evaporates to form clouds which brings rain.
3. The sea water also helps the land to cool due to breezes.
4. The salt and minerals are also obtained from sea water.
5. Corals and pearls are obtained from sea animals.
6. Thus, sea water is useful even though it is not potable.

3.  What will happen if

Question a.

Question a.
Microbes in soil get destroyed.
Answer:

1. Microbes in the soil decompose dead plants and animals and convert it into humus. This humus supplies nutrients to the soil.
2. Humus also aerates soil and holds water in it. It makes the soil more fertile.
3. If microbes are destroyed, humus will not be formed and the soil will not become fertile, making it unsuitable for growth of plants. Also dead and decaying matter will accumulate on land.

Question b.
The number of vehicles and factories in your surroundings increases.
Answer:

1. Vehicles and factories are the major cause of air pollution.
2. They release harmful gases like carbon dioxide, carbon monoxide and sulphur dioxide into the air.
3. These pollutants are harmful to the environment and to the people living in the surrounding area.
4. Hence, if the number of vehicles and factories in our surroundings increases, the air pollution will also increase.

Question c.
The total supply of potable water is finished.
Answer:

1. Water plays very important role in the survival of living organism.
2. All living things are dependent on water.
3. A very small quantity of water is potable and can be used for drinking.
4. All bodily functions are regulated by water.
5. Therefore, if total supply of potable water is finished, plants and animals will not survive and there will be no life on earth.

4. Match the following. 

Question a.

Group ‘A’	Group ‘B’
1. Carbon dioxide	a. Generation of soil
2. Oxygen	b. Rain
3. Water vapour	c. Plants and food production
4. Microbes	d. Combustion

Answer:

Group ‘A’	Group ‘B’
1. Carbon dioxide	c. Plants and food production
2. Oxygen	d. Combustion
3. Water vapour	b. Rain
4. Microbes	a. Generation of soil

5. Name the following.

Question a.
Constituents of biosphere.
Answer:
Atmosphere, hydrosphere, lithosphere and all living things on earth.

Question b.
Biotic constituents of soil.
Answer:
Microbes, worms, insects, burrowing rhodents like rats, mice, roots of trees and plants.

Question c.
Fossil fuel.
Answer:
Crude oil from which we get kerosene, petrol, diesel, paraffin wax and tar.

Question d.
Inert gases in air.
Answer:
Neon, argon, helium, krypton, xenon.

Question e.
Gases that are harmful to ozone layer.
Answer:
Chlorofluorocarbon and carbon tetrachloride.

6. True or False?

Question a.
Land and soil is the same thing.
Answer:
False – Land consists of stones, soil and big rocks.

Question b.
The water in a lake is called ground water.
Answer:
False – Water trapped below the ground over the bedrocks is called ground water.

Question c.
It takes about thousand years to form a 25 cm thick layer of soil.
Answer:
False – It almost takes around thousand years to form a 2.5 cm thick layer of soil.

Question d.
Radon is used in decorative lights.
Answer:
False – Neon is used in decorative lights.

7. Answer in your own words. 

Question a.
Explain with the help of a diagram how soil is formed.
Answer:

1. The soil on the land is formed by a natural process.
2. The abiotic components of soil are supplied through the weathering of the bedrock.
3. Due to heat, cold wind and rain the bedrock breaks down into pieces.
4. Stones, sand and soil are formed from these pieces.
5. Microbes, worms, insects, rodents and roots of trees growing on land help in weathering of rocks.
   
   This process is slow, continuous and it takes a thousand years to form 2.5 cm thick layer of mature soil.

Question b.
Why is there a shortage of water even though it occupies about 71% of the earth’s surface?
Answer:

1. 71% of earth’s surface is covered with water of, which 97% is salty water present in seas and oceans and 2.7% water is available as ground water, ice and in other forms.
2. Only 0.3% water is available as fresh water which can be used for drinking.
3. All the living organisms require water to drink. The water is used in the industry and also for farming.
4. Due to increasing population and uncontrolled usage, we experience shortage of water.

Question c.
What are the various constituents of air? Write their uses.
Answer:
Air contains gases like oxygen, carbon dioxide, nitrogen, inert gases, water vapour and dust particles. The uses of constituents of air are as follows.

Question d.
Why are air, water and land considered to be valuable natural resources?
Answer:

1. The various components of air help and support the growth of living organisms.
2. Nitrogen is used to make proteins, oxygen is used for respiration and carbon dioxide is used to make food by plants.
3. Similarly, land supports growth of terrestrial plants and animals. It provides important minerals to plants and also to human beings.?
4. It is the shelter for worms, insects and rodents and supports their growth. Plants also cannot survive without land.
5. Water is necessary for carrying out all life processes in the living organisms and without water there will be no life on earth.
6. Hence land, air and water are considered valuable natural resources.

Activity:

Natural Resources Air, Water And Land Class 6 Questions And Answers Question 1.
Obtain detailed information about the work of the India Meteorological Department.

Natural Resources Air Water And Land Class 6 Questions And Answers Question 2.
Find a remedy for water scarcity.

Class 6 Science Chapter 1 Natural Resources – Air, Water and Land Important Questions and Answers

Fill in the blanks and rewrite the completed statements.

Class 6 Science Chapter 1 Natural Resources Air, Water And Land Exercise Question 1.
……………. gas, used for refrigeration and air conditioning, destroys the ozone layer.
Answer:
Chlorofluorocarbon or carbon tetrachloride

Natural Resources Air Water And Land Class 6 Exercise Question 2.
Air becomes ……………. at higher altitudes.
Answer:
rarer

Natural Resources Air Water And Land Class 6 Question 3.
………….. of land is reduced if green trees and bushes are grown in it.
Answer:
Erosion

Natural Resources Air Water And Land Question 4.
16th September is celebrated as ………. Day all over the world.
Answer:
Ozone Protection

Natural Resources Air Water And Land Question Answer Question 5.
………….. is the layer of air that surrounds the earth.
Answer:
Atmosphere

Natural Resources Air, Water And Land Question 6.
……………. occupies the largest part of the earth’s surface.
Answer:
Hydrosphere

Natural Resources Air Water And Land Class 6 Question 7.
Gases are not found in the …………… and beyond.
Answer:
exosphere

Choose the correct alternative:

Question 1.
………….. percentage of the land is covered by water.
(a) 70%
(b) 81%
(c) 71%
(d)80%.
Answer:
71%

Question 2.
The gas used in fluorescent tubes is ………………… .
(a) Argon
(b) Helium
(c) Neon
(d) Krypton.
Answer:
Krypton

Question 3.
The ozone layer is found in the lower part of …………… .
(a) atmosphere
(b) stratosphere
(c) mesosphere
(d) trophosphere.
Answer:
stratosphere

Question 4.
Gas released in air on combustion of fuel is …………….. .
(a) Hydrogen sulphide
(b) Carbon tetrachloride
(c) Nitrogen dioxide
(d) Oxygen
Answer:
Nitrogen dioxide

Question 5.
The proportion of humus in the upper layer of good fertile soil is about ……………… .
(a) 23% to 45%
(b) 33% to 50%
(c) 30% to 53%
(d) 13% to 33%
Answer:
33% to 50%

Match the following:

Question 1.

Group ‘A’	Group’B’
1. Argon	a. temperature for obtaining low
2. Neon	b. Used in electric bulb
3. Xenon	c. Decorative lights
4. Chlorofluoro – carbon	d. Flash photography
5. Helium	e. Ozone depletion

Answer:

Group ‘A’	Group’B’
1. Argon	b. Used in electric bulb
2. Neon	c. Decorative lights
3. Xenon	d. Flash photography
4. Chlorofluoro – carbon	e. Ozone depletion
5. Helium	a. temperature for obtaining low

Name the following:

Question 1.
Substances formed when fuel burns.
Answer:
Carbon dioxide, carbon monoxide, nitrogen dioxide, sulphur dioxide and smoke.

Question 2.
Layers of the atmosphere.
Answer:
Troposphere, stratosphere, mesosphere, ionosphere and exosphere.

Question 3.
Layers of land.
Answer:
Humus, mature soil, immature soil, small rocks and stones and bedrock.

Question 4.
Gas necessary for building proteins.
Answer:
Nitrogen.

State whether True or False. Correct if False.

Question 1.
The amount of gases in the air is greatest near the surface and becomes rarer at higher altitudes.
Answer:
True.

Question 2.
Fogs, clouds, snow, and rain are produced in the exosphere.
Answer:
False – Fogs, clouds, snow and rain are formed in the troposphere and lower stratosphere of the atmosphere.

Question 3.
Fossil fuels are formed from the dead remains of animals and plants buried underground for a long period.
Answer:
True.

Explain what will happen if:

Question 1.
Forests are destroyed.
Answer:

1. Soil will get eroded due to rains as roots of trees hold the soil.
2. The land will become barren as trees helps to increase the level of ground water.
3. Amount of carbondioxide in the air will increase as trees use carbondioxide for photosynthesis and release oxygen.
4. Natural habitat of many animals will get completely destroyed.

Question 2.
What would have happened if there was no air on the earth?
Answer:

1. Air contains gases like nitrogen, oxygen, carbon dioxide, dust particles and water vapour, which are used in various piofeesses in living organisms and environment.
2. If there is no air then there will be no life as oxygen is essential for all living beings to survive. Also atmosphere is a very important filter. It prevents die harmful elements from reaching the earth.
3. Hence without air, our earth would become a cold, dark planet without any life.

Answer the following:

Question 1.
What is humus?
Answer:
Humus is the topmost layer of the soil formed d by decomposition of remains of plants and animals and it makes the soil fertile.

Question 2.
What is land made up of?
Answer:
Land is made up of stones, soil, sand and big rocks.

Question 3.
Is land flat everywhere?
Answer:
No, land is not flat everywhere. It is flat in some regions and hilly in some regions.

Question 4.
Does man produce soil/ land?
Answer:
No, man does not produce soil/land, it is produced naturally.

Question 5.
What do you see on land?
Answer:
We see mountains, rivers, valleys, ocean, also terrestrial animals and plants. We also see roads, bridges, buildings etc.

Question 6.
What has man created on land?
Answer:
Man has dug wells, borewells to lift ground water. He has also constructed bunds and dams. He has also built many industries, buildings, roads for transport.

Question 7.
If a deep pit is dug in the ground, what do you see there?
Answer:
We see different layers of land.

Answer in your own words.

Question 1.
Explain with the help of diagram various layers of land.
Answer:

• Humus – Topmost layer, fertile layer formed by decomposition of remains of plants and animals. Immature
• Soil – Sand, soil, small stones, worms and insects.
• Layer of soil and small rocks – less soil and more rocks.
• Bedrocks – main minerals are obtained from this layer, determines colour and texture of soil.

Observe the picture and answer the questions.

Question 1.
Where do you see the birds?
Answer:
The birds are flying in the sky.

Question 2.
Where is the cow grazing?
Answer:
The cow is grazing in the pasture (field).

Question 3.
Locate the trees.
Answer:
The trees are seen along the river bank.

Question 4.
Where does the river come from?
Answer:
The river flows from the mountains towards the plains.

Question 5.
Where is the aeroplane?
Answer:
The aeroplane is in the sky above the clouds.

Question 6.
Where are fishes seen?
Answer:
Fishes are seen swimming in the river water.

Question 7.
On what is the sail boat floating?
Answer:
Sail boat is floating on the water.

Observe and discuss:

Question 1.
What is the similarity in the three pictures given above?
Answer:
All the pictures given above show large scale emission of smoke through different agencies. This smoke directly mixes with the atmosphere, disturbing the balance between the constituents of air and causing air pollution.

Observe and discuss:

Observe the distribution of water on the earth surface and complete the table.

Question 1.

Answer:

Water available on earth	percentage
Seas, oceans	97%
Groundwater and water in other forms	2.7%
Water available for drinking	0.3%
Total	100%

Observe given figure carefully and answer the following.

Question 1.
For which purpose is water being used?
Answer:
Water is being used for washing clothes, for bathing, farming, drinking, and industries.

Question 2.
Do other living things use water like we do?
Answer:
Animals do not use water like us. They use water only for drinking. Some animals like buffaloes, rhinoceros, elephants use water for cooling themselves during summers.

Question 3.
What are the constituents of soil? Classify them as biotic and abiotic constituents.
Answer:
The constituents of soil are humus, soil, sand, gravel, stones, bedrock, insects, worms, microbes, roots of trees and dead leaves, burrowing rodents like mice and rats.

Biotic	Abiotic
Microbes, rodents like mice and rats, humus containing microbes and dead leaves.	Soil, sand, gravel, stones, bedrock.

Answer the following:

Question 1.
How would you save water? Give some measures you will adopt.
Answer:
Water can be saved in the following ways:

1. Repair the leaking taps and pipes and prevent wastage of water.
2. Take water in a bucket to wash a car, rather than using a hose pipe.
3. Close the tap when not required.
4. Store rainwater in underground tanks so that it can be used all round the year.
5. Water leftover after washing vegetables etc. can be used for watering plants in the garden.
6. Use water sparingly and reuse water wherever possible.

Question 2.
What measures would you take to prevent soil erosion?
Answer:

1. The trees, bushes and grass shall be planted in open spaces.
2. Shrubs will be planted along the river banks to prevent floods.
3. Proper drainage system will be provided so that there is no flooding of water.

Let’s try this

1. Take a transparent plastic bottle, a handful of soil, big stones, small stones, sand, some dry leaves and water.
2. Cut off the upper tapering part of the bottle. Put the rest of the materials in the lower part and add water.
3. Stir the mixture thoroughly and put it aside.

Observe it the next day and answer.

Question 1.
How does the mixture in the bottle look now?
Answer:
The mixture gets segregated into various layers. Heaviest substances settle down and lighter forms topmost layer.

Question 2.
Do you see the layers in it?
Answer:
Yes, we see the layers of soil.

Question 3.
What is seen in the different layers from top to bottom?
Answer:
The dry leaves are floating above the water at the top. Then the layer of the soil, which forms a layer above the sand. Below the sand we see a layer of small stones, and the big ones have settled down at the bottom of the bottle.

Question 4.
Obtain specimens of soil from various places and note the differences in the specimen with respect to colour, feel, texture and size of the particles.
Answer:

Area from where soil sample is taken	Colour	Texture
1. Own yard	Red colour	Smooth soil which is dry.
2. Garden	Black colour	Sticky soil, rich in humus and insects.
3. Hills	Red colour	Rough soil with small stones and pebbles.
4. River banks	White colour	Sandy and moist in nature.
5. Fields	Black soil	Sticky soil with fine particles, rich in humus and worms.
6. Rocky ground	Black	Coarse with stones and pebbles, hardly any fine soil is seen.

Question 5.
Observe how much water is used and for what purposes it is used in your house for a whole day. Record it in a chart. Discuss this data and find out how much water each person needs in your house.
Answer:

Purpose for which water is used	Amount of water (approx in litres)
1. Bath	50 litres
2. Brushing teeth	1 litre
3. Washing clothes and utensils	75 litres
4. Mopping the floor	10 litres
5. Drinking	8 litres
6. Cooking	6 litres
Total use of water	150 litres

Total number of persons = 3
Total water used per person = \(\frac{50}{3}\) = 50 litres.
Approximately 50 litres of water is required for 1 person.

Class 6 Questions And Answers

6th Std Science Questions And Answers:

• Natural Resources – Air, Water and Land Class 6 Questions And Answers
• The Living World  Class 6 Questions And Answers
• Diversity in Living Things and their Classification Class 6 Questions And Answers
• Disaster Management Class 6 Questions And Answers
• Substances in the Surroundings – Their States and Properties Class 6 Questions And Answers
• Substances in Daily Use Class 6 Questions And Answers
• Nutrition and Diet Class 6 Questions And Answers
• Our Skeletal System and the Skin Class 6 Questions And Answers
• Motion and Types of Motion
• Force and Types of Force Class 6 Questions And Answers