CBSE Class 5 Science Revision Worksheet Set G

Topic : Our Skeletal System

Q1. Write following new words two times in your note book-
1. Skeletal
2. Organ
3. Ligament
4. Vertebrae
5. Hinge
6. Pivot
7. Cardiac
8. Voluntary
9. Muscles
10. Tendons

Q2. Define the following terms- .
1. Vertebrae- Each small bone of the vertebral column.
2. Bone Marrow- The soft, spongy material found inside the cavities of long bones.
3. Ligaments- Strong tissues that bind at a joint.
4. Tendons- Strong fibres with which muscles are attached to bones.
5. Voluntary muscles- Muscles under our control.
6. Involuntary muscles- Muscles not under our control.
7. Cardiac muscles- Muscles of the heart.

Short question/ Answers:-

1. What is a joint?
Answer : A joint is a meeting point of two bones.

2. Name the different kinds of movable joints in your body.
Answer : The different kinds of movable joints in our body are hinge joint, ball and socket joint, pivot joint and gliding joint.

3. Which part of the facial region is movable? How does it help us?
Answer : The lower jaw of the facial region is movable. It enables us to talk and eat.

4. What is bone Marrow?
Answer : The long bones of the skeleton are hollow and are filled with a soft, fatty substance called bone marrow.

5. What are tendons?
Answer : Strong fibres with which muscles are attached to bones are called tendons.

Long question/ Answers:-

1. How is our skeleton useful to us?
Answer : Our skeletal is useful to us in many ways-
1. It gives support, strength and shape to the body.
2. Bones protects all the internal organs of the body.

2. What is the difference between voluntary and involuntary muscles?
Answer : The difference between voluntary and involuntary muscles are- voluntary muscles are attached to our skeleton are under our control and involuntary muscles are not under our control.

3. How do muscles work?
Answer : Muscles produce movement in the body by pulling on the bones. When a muscle contracts, the bones come close to each other.When the knee bends, one muscle contracts and get shorter, whereas other one relaxes.

4. How can we keep our muscles in good shape?
Answer : To keep the muscles in good shape, we must maintain a good posture while we sit or stand or walk.

A. Hardwords:-
1. Interaction
2. Organism
3. Biodegradable
4. Pollution
5. Erosion
6. Industrialization
7. Deforestation
8. Urbanisation
9. Automobiles
10. Extinct

B. Define:-
1. Consumers: Organisms that can’t make their own food but depends on producers, Eg. Animals.
2. Biodegradable: The waste that can be degraded or decayed easily by microbes.
3. Pollution: It is an undesirable change that takes place in air, water or land.
4. Future Generation: Children yet to be born.

C. Name the Following:

Question. The surroundings in which we live.
Answer : Environment

Question. Disease caused by polluted water.
Answer : Typhoid

Question. Process of cutting down of the forest.
Answer : Deforestation

Question. Date on which World’s Environment Day celebrated.
Answer : 5 June

Question. A cause of Natural Air Pollution.
Answer : Volcano

D. Answer the Following Questions:-

Question. Name the diseases caused by air pollution
Answer : The diseases caused by air pollution are:
a. Asthma
b. Lung Cancer
c. Bronchitis

Question. What are the two types of air pollution?
Answer : Two types of air pollution are:
i. Natural Air Pollution
ii. Man Made Air Pollution
i. Natural Air Pollution- Pollution caused by natural sources like volcanoes, dust storm, forest fire,etc.
ii. Man Made Air Pollution- Pollution caused by man-made sources like deforestation, industrialization, burning of fuels, etc.

Question. Mention the uses of Plants.
Answer : The uses of plants are:
i. Plants are the main source of food
ii. We get medicines from plants
iii. We obtain wood, rubber, paper from plants.
iv. Plants give us oxygen.

Question. List out the uses of Animals.
Answer : The uses of animals are:
i. We get wool for clothing
ii. We get leather from animals
iii. We get milk, meat and eggs from them
iv. Animals are used for transporting also.

Question. Write any four ways to reduce air pollution.
Answer : The ways to reduce air pollution are:
i. Use public transportation
ii. Plant a garden
iii. Make use of solar energy
iv. Avoid plastic bags

Q1 State True or False:

(a) Brain is protected by twelve bones in the skull. (..……..)

(b) The rib cage protects our spinal cord. (…………)

(c) The respiratory system helps in digestion of food. (…………)

(d) All the bones in the skull are fixed except the lower jaw. (…………)

(e) Blood cells are made in the bone marrow. (…………)

(f) A muscle is a tough elastic substance which holds the bone together at the joints. (…………)

(g) Ball and socket joint allows movement in many directions. (……………)

Q2 Fill in the blanks with the given words.

Cartilage skeletal system skull backbone ribcage Hi friends! I give shape to the body. I am the ……………….. Many bones in me are organized in a fixed manner. I mainly consist of …………………and limbs. The joints in me are of four kinds. …………………. is a tough elastic substance, without which the bones would rub against each other and wear out.

Q-1 Write two examples of each of the following:-

1. Monocot seeds ______
Answer : gram, peas

2. Dicot seed ______
Answer : wheat, rice

3. Communicable diseases ______
Answer : typhoid, common cold

4. Non communicable diseases ______
Answer : Scurvy, Beriberi

Q-2 Answer in one word:-

1. The process of scattering of seeds ______
Answer : Dispersal

2. Seed leaves are also called ______
Answer : cotyledons

3. Outer covering of seeds ______
Answer : seed coat

4. A practice of growing crops ______
Answer : Agriculture

5. Baby plant is also known as ______
Answer : Seedling

6. Body building nutrients ______
Answer : Proteins

7. Protective Nutrients ______
Answer : Vitamins

8. Germs in milk killed by ______
Answer : Pasteurization

Q3. Tick the correct answer:

1. Process of scattering of seeds is called
a) Dispersal
b) germination
c) farming
d) growing
Answer : A

2. Seeds are dispersed through
a) Water
b) wind
c) animals d) all of these
Answer : D

3. To stay healthy our body needs
(a) Balanced diet
(b) milk
(c) book
(d) roughage
Answer : A

4. The disease is caused by a virus
(a) Typhoid
(b) malaria
(c) meningitis
(d) Chicken pox
Answer : D

Q4 Define the following terms:

1. Seed coat:
Answer : The Outer covering of seed

2. Germination:
Answer : The process by which a plant grows from a seed.

3. Balanced diet:
Answer : A diet which contains all the nutrients in correct quantities.

I. Fill in the blanks:-

1. __________ is made up of very tiny particles called molecules.

2. Breaking away of rocks by wind,rain and snow is called _________.

II. Name the following :

1. A substance that dissolves in a liquid.

2. A rock that is used to make blackboards.

III. Give two examples of:

1. Metamorphic rocks

2. Chemical change

III. Write any one use of:-

1. Gas in liquid solution

2. Conglomerate

IV. Define the following terms:-

1. Miscible solution

2. Sediment

V. Give reasons:-

1. Solids have a fixed shape and size .

2. There is no increase in the volume of solution when sugar is added.

VII. Answer the following:-

1. How are intrusive igneous rocks different from extrusive igneous rocks?(any two points)

2. What is a physical change? Give two examples of it.

3. What is a saturated solution? Name the different types of solution.

Topic : Plants: Increasing the number

Q-1 Write two examples of each of the following:-

1. Dispersal by wind___________,__________
Answer : Cotton, Maple

2. Dispersal by water___________,__________
Answer : Coconut, Lotus

3. Dispersal by animals ___________,__________
Answer : Tiger’s claws, Xanthium

4. Dispersal by explosion___________,__________
Answer : Okra, Poppy

5. Monocot seeds ___________,__________
Answer : Kidney, grasses

6. Dicot seeds_,______________
Answer : Beans, peas

7. Kharif crops___________,_____________
Answer : Rice, Maize

8. Rabi crops_____________’___________
Answer : Wheat, Cotton

Q-2 Answer in one word:-

1. The process of scattering of seeds.___________
Answer : Dispersal

2. Seed leaves are also called __________
Answer : Seed coat

3. Outer covering of seeds. ___________
Answer : Cotyledons

4. A practice of growing crops. ___________
Answer : Agriculture

5. Baby plant is also known as_________
Answer : Seedling

6. The process by which a plant grows from a seed.___________
Answer : Germination

I.) Fill in the blanks: - (5)

1) The disease causing microorganisms are called …………..

2) Germs can be seen under a ………………

3) Vitamin A deficiency leads to …………..

4) Vitamin D is essential for the health of ………….

5) Excess of ……………. creates an imbalance of water.

II.) State whether the following statements are True or False :-

1) AIDS spread through animal bites.

2) Sunlight is a natural disinfectant.

3) Immunity is the ability of our body to recognize and destroy germs.

4) The living organisms that carry disease causing agents are called vectors.

5) Ricket’s patient are advised to sit in the sun.

III.) Match the following:- 

1) Fungi a) Scurvy

2) Virus b) Anaemia

3) Vitamin C c) Iodine

4) Goitre d) AIDS

5) Iron e) Ringworm

IV.) Answer the following questions:-

1) What are deficiency diseases?

2) What is vaccination? How is it helpful? 

3) List some wrong food habits?

Q-1 Write two examples of each of the following:-

1. Sources of carbohydrates.______,_____
Answer : rice, potato

2. Sources of proteins______,_____
Answer : milk, pulses

3. Sources of fats______,_____
Answer : oil, butter

4. Sources of vitamin A______,_____
Answer : carrot, milk

5. Sources of vitamin B______,_____
Answer : cereals, peas

6. Sources of vitamin C______,_____
Answer : orange, tomato

7. Sources of vitamin D______,_____
Answer : milk, fish

8. Sources of iron______,_____
Answer : spinach, grapes

9. Sources of iodine______,_____
Answer : seafood, iodised salt

Q-2Write deficiency disease name caused by the deficiency of:-

1. Vitamin A.______,_____
Answer : Night blindness

2. Vitamin B______,_____
Answer : Beriberi

3. Vitamin C______,_____
Answer : Scurvy

4. Vitamin D______,_____
Answer : Rickets

5. Iodine______,_____
Answer : Goiter

6. Iron.______,_____
Answer : Anaemia

Q-3Write two diseases caused by:-

1. Bacteria______,_____
Answer : Typhoid, Cholera

2. Protozoa______,_____
Malaria, dysentery

3. Viruses______,_____
Answer : Common cold, Polio

Q. I Choose the correct options:

1. …………………. Leaves are called as the “Green gold of Orissa”.

a. Areca nut leaves b. Amla leaves c. Tendu leaves d.Brahmi leaves

2. A Plant that reproduces through leaves…

a. Banana b. Grapes c. Lotus d. Bryophyllum

3. Which is the smallest bone in human body?

a. Stirrup b. Femur c. Humeru s d. breast bone

4. Musk deer are being hunted for……..

a. Pashmina b. Kasturi c. Cavier d. bone vine

5. Beri-Beri is a deficiency disease of …………

a. Protein b. Iodine c. Vitamin B d. Iron

Q. II Answer the following in one word or in a sentence:

1. What happens to haemoglobin content in Anaemia? 2

2. What happens to curd if it is not stored in the refrigerator? 2

3. What are Enzymes? 2

4. What do you mean by Food chain and FOOD WEB? 2

5  Name any Five products that are obtained from forests. 2

Q. III Short answer type questions:

1. How is a national park different from a wild life sanctuary? 3

2. What do you mean by seed dispersal? Give example of the plant that have A ) Seed dispersal by wind B ) Seed dispersal by thorny or hooked fruits.

3. How is a ball and socket joint work? 3

4. What helps the fishes to feel the waves of water? 3

5  How do forest act as ‘Water tanks’? 3

Q .IV Long answer type questions:

1. What is Breathing ? Explain ‘Exhalation’ and’ Inhalation’ in respiratory system.

2. What is Wild life trade? Give any two steps to prevent cruelty to animals.

3. Differentiate between:

a. Extinct and Endangered animals

b. Communicable and Deficiency diseases

4. Define : a. Malnutrition b. Nutrients 4

5  Explain any two reasons for the spoilage of food. 4

Q. V Descriptive or very long answer type questions:

1. Whaat is deforestation? Write any five harmful effects of deforestation.

2. What is Vegetative Reproduction? Why is it important in plants? 5

3. Draw a Labelled structure of a ‘Seed’? explain the function of different parts of it.

4. What is Reproduction in plants? In How many ways the reproduction takes place in plants? Explain.

5 Write the symptoms of the following diseases:-

a. Scurvy b . Night blindness c. Anaemia d. Protein

6. What are joints? How many types of Joints are found in human body ? Explain with example.

7. Why is our backbone made up of many small vertebratae instead of having one straight long bone?

8. Make a Food Chain of the following animals:
Frog , Caterpiller, Plants , Grasshoper, Fish

Topic : Food and Health

Q1. Define the following terms:-

1. Nutrients:_______________
Answer : The substance present in the food that are needed by our body for Good health and growth are called nutrients

2. Balanced diet:_______________
Answer : A balanced diet contains all the nutrients in correct quantities

3. Disease:_______________
Answer : An abnormal condition in which the body is not able to function properly.

4. Communicable diseases:_______________
Answer : The diseases that spread from one person to another person

5. Non Communicable diseases:_______________ 
Answer : The diseases caused due to deficiency of nutrients in the diet.

6. Deficiency diseases:_______________
Answer : Some diseases occur because of the lack of nutrients are called deficiency diseases.

7. Pasteurization:_______________
Answer : The process in which milk is heated at a high temperature for at least half an hour and then cool down quickly to kills harmful bacteria

8. Vaccination:_______________
Answer : The act of injecting vaccine to protect against a disease

9. Heamoglobin:_______________
Answer : A Protein in red cells that carries oxygen from the lungs to the tissues.

10. Contaminate:_______________
Answer : Infect or make impure.

11. Eradicate:_______________
Answer : To get rid of something completely.

Choose the correct option

1) Which one of the following animals can trick its enemies by camouflaging?
a) Elephant
b) deer
c) Chameleon
d) Vulture
Answer : C

2) A smooth surface will cause
a) Less friction
b) More friction
c) No friction
Answer : A

3) Rotation Causes
(a) Day and night
b) Winds
c) Seasons
d) None of these
Answer : A

4) A planet with rings
(A)Uranus
b) Saturn
c) Mars
d) Jupiter
Answer : B

5) The axis of the Earth is
a) Straight
b) Curved
c) Titled
d) long
Answer : C

6) Which one of the following forms of energy can be used to produce electricity
a) Solar energy
b) Wind energy
c) Water energy
d) All the above
Answer : D

7) The hard outer covering of insects is made up of
a) Scales
b) Chitin
c) Feathers
d) Gills
Answer : B

8) Which one of the following is a blood vessel.
a) Vein
b) Heart
c) Ureter
d) Kidney
Answer : A

9) leaves appear green due to the presence of
a) Stomata
b) Chlorophyll
c) Soil
d) oxygen 
Answer : B

10) Which one of these is called energy giving food?
a) Carbohydrates
b) Proteins
c) Vitamins
d) Minerals
Answer : A

11) Fibres made by man are called
a) Natural fibres
b) Synthetic fibres
c) Cotton
d) silk
Answer : B

12) The particles are packed very close to each other in
a) Solids
b) Liquids 
c) Gases
d) Fluids
Answer : A

13) The process by which a liquid changes into a vapour
a) Condensation
b) Evaporation
c) Sublimation
d) None of these
Answer : B

14) The uppermost layer of the soil is called
a) Sub soil
b) Bed rock
c) Top soil
d) clay
Answer : C

15) The flat part of the leaf is known as the
a) Leaf blade
b) Vein
c) Midrib
d) stalk
Answer : A

Topic : Plants: Increasing the number

Fill in the blanks with suitable words:-

1. A seed with two seed leaves is called a ________
Answer : dicot seed.

2. New plants grow from the leaves of________
Answer : bryophyllum.

3. A ________outer covering helps a coconut fruit to float in water.
Answer : fibrous

4. Plants help to reduce soil ________
Answer : erosion.

5. mals________ and ________are the agents of dispersal.
Answer : Wind, water, ani, explosion

6. A germinating seed needs ________ and ________
Answer : air, water, warmth.

7. Most plants grow from ________
Answer : seeds.

8. Small and light seeds mostly dispersed by ________
Answer : wind.

9. Spores are generally found in ________
Answer : leaves.

10. Poppy and Geranium fruits scattered through ________
Answer : explosion.

11. ________protects the embryo from injury and drying.
Answer : Seed coat

12. Kidney bean is a ________ seed as it has two cotyledons.
Answer : dicot

13. Seed grow into a baby plant or ________
Answer : seedling.

14. is ________a process by which plant grows from seed.
Answer : Germination

15. Seeds must be ________ over a wide area to grow properly.
Answer : scattered

Answer the following question:-

1. Name the outer covering of a seed.
Answer : The outer covering of a seed is called seed coat.

2. What is a monocot seed?
Answer : The seed having one seed leaves or cotyledons is called monocot seed. ex- Wheat, rice, maize.

3. What is germination?
Answer : The process by which a seed produces a baby plant or seedling is called germination

4. What is meant by dispersal of seeds?
Answer : The process by which seeds are scattered away from the parent plants is called dispersal of seeds.

5. What are kharif crops?
Answer : Crops grown from June to October are called Kharif or summer crops.

6. Why do we spray pesticides on crops?
Answer : Pesticides protect the crops from being destroyed by pests.

7. What are essential for a seed to grow into plant?
Answer : Water, air, soil and sunlight are essential for a seed to grow into plant.

8. Why do seeds need to be dispersed?
Answer : For proper growth of plants, seeds must be scattered so that seeds can get proper water, air and space.

9. Which types of the seeds dispersed by wind?
Answer : Seeds dispersed by wind have light weight and wings and hair on them.

10. What is agriculture?
Answer : Practicing of growing crops in large scale is called agriculture.

I. Answer in one word.

a. The layer above the core.

b. A substance made naturally by the combination of many minerals.

c. A form of condensation in which water falls back to earth as liquid.

d. A state when the volcano is not active.

e. It is caused due to the deficiency of iron.

II. Answer the following.

a.Eating carrots can improve your eyesight.

b. We should all eat lemons and oranges.

Topic : Soil Erosion and Conservation

Q1. Write following new words two times in your note book-
1. Erosion
2. Conservation
3. Deforestation
4. Afforestation
5. Embankments
6. Overgrazing
7. Cultivation
8. Terraced
9. Saplings
10. Environment

Q2. Define the following terms- .
1. Soil Erosion- the process of wearing away of soil over a period of time.
2. Deforestation- felling trees in large number.
3. Soil Conservation- Prevention of loss of soil.
4. Afforestation- the process of growing more trees by planting saplings.
5. Embankment- wall along a river bank.

Short question/ Answers:-

1. What is meant by soil erosion?
Answer : The condition of wearing off or carrying away of soil by the action of water or wind is known as soil erosion.

2. What is soil conservation?
Answer : The protection of soil against erosion is called soil conservation.

3. What is meant by afforestation?
Answer : The process of growing more trees by planting saplings is known as afforestation.

4. When is ‘Earth Day’ celebrated every year?
Answer : Earth Day is celebrated every year on 22nd April.

5. What do the three Rs stand for?
Answer : The three Rs stand for – Reduce, Reuse and Recycle - to protect the environment.

Long question/ Answers:-

1. Why do we say that soil is the foundation of life?
Answer : We say that soil is the foundation of life because it supports plants which provide food to all living things on this planet.

2. How was soil formed from rocks?
Answer : When the earth was formed, there were only water, air and hard rocks. The sun heated the rocks .The rain made them cold and the wind blew over them. As a result, the rocks broke into small pieces. These small pieces broke into still smaller pieces. They rubbed against each other till they become tiny particles It took millions of years for these loose particles to change into soil.

3. How does water act as an agent of soil erosion?
Answer : Water acts as an agent of soil erosion. Heavy rains cause floods. Flooded rivers and running water washes the soil off the hill slopes.

4. Why do some rivers change their course?
Answer : A river coming down the hills carries a lot of mud with it. Upon reaching the plains, the flow of the river slows down. It leaves part of the soil on its way .Over a period of time soil accumulates and makes the river change its course.

5. How is man responsible for soil erosion?
Answer : Man is responsible for soil erosion in following ways-
1. When trees are cut down the soil becomes loose and its easily carried away.
2. Ploughing of hill slopes.
3. Overgrazing of cattle.

6. List three ways by which soil can be conserved.
Answer : The three ways by which soil can be conserved are
1. To prevent the soil from getting blown away, farmers grow cover crops.
2. Trees and bushes are grown along the boundary of the fields.
3. To prevent floods, embankments along river banks are built.

Q.1 Unscramble the words to complete the paragraph. The clue letters are numbered and given in the brackets along with some words. You can solve the riddle given in question 2 easily using these clues. 

(a) Do you drink milk from plastic containers, soft drink from metal cans or eat jam from glass jars? These containers are made from natural SEROUCSER__ __ __ __ __ __ __ __ __ (clue 1- the 4th letter), which are mined, transported, and then made into plastic, metal, or glass at a ORTACYF__ __ __ __ __ __ __ (clue 2- the 7th letter). This entire RUNTGAFNICAMU __ __ __ __ __ __ __ __ __ __ __ __ __ (clue 3- the3 rd letter) process releases harmful greenhouse gases and causes climate change. By recycling or reusing plastic, LEMAT__ __ __ __ __, or glass items, you can reduce the need to mine, transport, and manufacture natural resources to make new products. In other words, you reduce the amount of SHOUERNEEG__ __ __ __ __ __ __ __ __ __ (clue 4- the 3rd letter) gases released and help prevent climate change.

(b) Do you use paper products such as paper napkins, paper towel or wrapping paper? To make these items, SRETE __ __ __ __ __ must be cut down, transported by truck, and processed into paper at paper mills. This procedure ALEERSES __ __ __ __ __ __ __ __ (clue 5- the 5th letter) greenhouse gases and adds to climate change. By reducing the NATMUO __ __ __ __ __ __ of paper you EUS __ __ __ (clue 6- the 1st letter) everyday or by recycling paper, you help reduce greenhouse gases from being released during the manufacture of paper. You also help preserve trees, which naturally absorb a green house gas called RBAONC__ __ __ __ __ __ DIEXIDO __ __ __ __ __ __ __ (clue 7- the 1st letter) from the air, helping to prevent climate change.

(c) Are there ever bits of food left over after your dinner or vegetable peel from your kitchen?

By collecting these materials, piling them in a spot in your garden at home, and stirring them regularly to allow air penetration, you can create a TOMPSOC__ __ __ __ __ __ __ (clue 8- the 3rd letter) pit. This activity keeps these materials out of a landfill, where they decay and release greenhouse gases. Composting also helps plants to grow. Plants, just like trees, ROBSAB __ __ __ __ __ __ carbon dioxide, removing it from the air and helping to prevent climate change.

Q.2 Using the clues from the above paragraphs, complete the sentence. 

‘Planet Protectors’ 

Secret Saying: 

Who can help protect the Earth from climate change?
_  _  _  _  _  _  _  _
2  1  6  5  3  4  8 4 

Topic : Our Nervous System

Q1. Write following new words two times in your note book-
1. Cerebrum
2. Cerebellum
3. Medulla
4. Sensory
5. Motor
6. Reflex
7. Spinal cord
8. Nervous
9. Cornea
10. Iris

Q2. Define the following terms- .
1. Cerebrum – The largest part of the brain.
2. Cerebellum- Lies below the cerebrum.
3. Medulla- Lies below the cerebellum.
4. Iris- The coloured circle inside the eye.

Short question/ Answers:-

1. The brain needs continuous supply of blood and oxygen. Why?
Answer : A person faints if his heart is not able to send enough sleep to his brain.

2. What are sensory nerves?
Answer : The nerves which bring messages from the sense organs to the brain or the spinal cord are called sensory nerves.

3. How is our brain protected from injuries?
Answer : Our brain protected from injuries by clear fluid which is filled inside the brain. .

4. What could happen if we clean our ears with a pointed object?
Answer : If we clean our ears with a pointed object we may injure the eardrum inside.

5. What is a reflex action?
Answer : Some of the actions are automatic we do not have to think before doing them. These actions are called reflex action.

Long question/ Answers:- ( draw fig 10.4 The human eye)

1. What does nervous system consist of? (draw fig 10.2 The human brain)
Answer : The nervous system consist of
1. Brain- The brain is the control centre of the human body. It receives information from all the parts through different nerves.
2. Spinal cord- It is enclosed inside a tough, bony but flexible spine. It connects the rest of the body to the brain through the nerves.
3. Nerves- Nerves are long thread like structures that carry messages between the brain and the other parts of the body.

2. Name the different parts of the brain. What work does each part do?
Answer : The different parts of the brain are
1. Cerebrum- It controls the working of our eyes, ears, nose and tongue. It controls our voice. We can think, learn, remember and recall because of the cerebrum.
2. Cerebellum-It coordinates the actions of the muscles and makes them work together .It helps us to balance our body and keeps us in an upright posture.
3. Medulla- It connects the brain to spinal cord. It controls involuntary actions like the movements of the lungs and the heart.

3. What are the nerves and what are their functions?
Answer : Nerves are made of bundles of fibres. Nerves are long thread like structures that carry messages between the brain and the other parts of the body.

4. How does food taste if we have a cold?
Answer : The surface of the tongue is covered with tiny bumps. Inside these bumps are cells called taste buds. The nerve endings in the taste buds detect the four major tastes: sweet, salty, sour and bitter. Food taste better when we can smell it. When a cold blocks our nose food does not taste so good.

5. How can you keep your skin healthy?
Answer : We can keep our skin healthy in following way-
1. Soap and water are enough to remove dirt and sweat from the skin.
2. Dry yourself thoroughly after bathing and wear clean and comfortable clothes.
3. A cut and scratch on the skin should be treated with an antiseptic lotion to prevent infection.