Science - Class 3

1:- What are living things ?

Ans:- The things that are alive are called living things.

Ex: - humans beings,  animal,  birds,  insects and plants 

2:- What are non living things?

Ans: - Things that are not alive are called non living thing things

Ex:-  stones,  rocks,  mountains and soil 

3:- Write six characteristics of living things .

 Ans: – the six characteristics of living things are

• Living things move.
• Living things breathe.                 
• Living things need food.
• Living things grow.
•  Living things feel.
• Living things reproduce.

4:- What locomotion

Ans:- movement of animals from one place to another place  is called locomotion

5:- What we call the movement of these living being?
 human , deer , kangaroo , rabbit , monkey , insects and bird.

Ans:- The movement of human is called walk.   
The movement of deer is called walk .

The movement of kangaroo is called hop. 
The movement of rabbit is called hop. 
The movement of monkey is called swing.

The movement of insect is called fiy and crawl. 
The movement of bird is called fiy

The movement of fish is called swim

The movement of snails, snake and earth worm is called crawl

6:- Write the name of a plant that turns their face towards the sun

Ans:-   sun flower

7:- Why do living things need food and water?

Ans:- Living  things need  food  and  water  to  live  and  to  get  energy  to  carry  out  different   work

8:- How do animals get there food

Ans:- Animals get there food directly or indirectly from plants. Cow, deer and sheep get food directly to the plant.  While lion and tiger get their food indirectly to the plants

9:- How does plant make their food

Ans:- plants make their food using sunlight, carbon dioxide, chlorophyll and water. this is called photo synthesis.

10:- By which organ  these  living beings  breathe ( cow, cat, dog, man, fish, insects, plant)

Ans:- Cow, cat, dog and man breathe through lungs.

Fish breathe through gills.

Insects breathe through spiracles present on their body.

Plant breathe through stomata

11:- How many sense organs we have to feel the objects around us ?

Ans:- We have five sense organs to feel the object around us. They are eyes, nose, tongue and skin

12:- What is reproduction ?

Ans:- All living beings reproduce other living beings of their own kind is called reproduction

13:- Write the process how these living beings reproduce their young ones. (human beings , animals , birds, plants)

Ans:- Human beings reproduce their young ones by giving birth.

Animals  reproduce their young ones by giving birth.

Birds reproduce their young ones by laying eggs.

Plants reproduce their young ones Through seeds and From plant parts .

 

parts of plant, chapter 2, class-3, science 

 

1:-What is root?

Ans :– The part of the plant which grows below the soil is called the root.

2:-What is shoot?

Ans:- The part of the plant which grows above the ground is called shoot.

3:-How many parts of a shoot? name them.

Ans:-There are five parts of shoot.

1-Stem

2-Branches

3-Leaves

4-Fruits

5-Flowers

4:- How many types  of root?

Ans:- There are two types of root.

               1-tap root

               2-fibrous root

5:- what is tap root?

Ans:- The root which have a thick root and several  thinner roots grow out from the main root is called tap root.

Ex:- carrot,  bean, Beet root and mustard.

6:- What is fibrous root?

Ans:- roots which are in the form of a bunch of threads like structure of similar size coming out from the end of the stem is called fibrous root.

For example:- grass, wheat, rice and onion have fibrous roots.

7:- Write three functions of root.

Ans:- The three functions of root are

               1-Root fixes a plant firmly in the soil.

               2-Root absorb water and minerals from the soil and send them up to the plant.

               3-Plants like carrot, radish and beetroot store their food in roots which we eat.

 8:- What is stem?

Ans:- The central part of a plant that supports the plant above the ground is called stem. Branches, leaves, buds, fruits and flowers grow on it.

9:-  How many types of stem? Name them.

Ans:- There are four types of stem.

1-trunk

2-thin and woody stem.

3-green and soft stem

4-weak and soft stem

10:- What are trunk?

Ans:- Big trees have hard and thick stem. These stems are called trunk.                                                                                                                                                                                                                                                                                                

                Ex:- stem of a mango.

                         Stem of a banyan.

11:-Write two plant that have thin and woody stem.

Ans:- Rose,  bougainvillea.

12: Write two plants that have green and soft stem.

Ans:- Mint ,  coriander.

13:- Write two plants that have weak stem that need supports?

Ans:- Money plants, Grapevine plants

14:- Write three functions of stem.

Ans:- The  three functions  of stem are: 

1-The stem gives support to the plant above the ground.

2-The stem bears leaves,  flowers,  buds and fruits.

3-Some stems like sugarcane store food in them.

 15:- Who is known  as the kitchen of plant?

Ans:-  Leaf  is known as the kitchen of plant.

16:- What is leaf blade?    

Ans:-   The flat part of a leaf is called  the leaf  blade.

17:- How many types  of  veins in a leaf?

Ans:- There are  two  types  of veins  in a  leaf. 

1-main veins

2- Side veins

18:- What are stomata?

Ans:-  The  tiny  holes  present   the  under surface  of  a  leaf  are  called  stomata.  Stomata help the plants to breathe.

19:- Why leaves are called food factory of a plant?

Ans:-  Leaves are called food factory of a plant because they  make  food for  the plant.

20:- Write a name  of  non  green   plant  that  cannot  make their own food.

Ans:-  Mushroom

21:- Write three functions of a leaf.  

Ans:-  The  three  functions  of  a  leaf  are. 

1-green  leaves  make food for  the plant  

2-leaves   give out  the oxygen in environment.  

3-some  leaves store  food  like  cabbage spinach  etc.

22:- Who is the most attractive part of a plant?

Ans:- flower

23:- Write  two flower that grow into fruit. 

Ans:- Apple  flower,  Guava  flower

24:- Write two  flowers  that store  food. 

Ans:- broccoli,  cauliflower

25:- What is fruit? 

Ans:-   Fruit  is a part  of  a  plant  that  is  formed   from   flower.

26:- Who protects the seeds? 

Ans:-  Fruits  protect  the seeds.

27:- Write  two  fruits  that  have  single  seed.

Ans:-   Mango,  Plum

28:- Write two   fruits that  have  many  seeds. 

Ans:-  Papaya,  Orange

29:- What are edible seeds? write two  example. 

Ans:- The seeds  that we can eat are called edible seeds.

Ex:-rice; wheat

30:-What are non edible seeds? Write example.

Ans:-  The seeds that we do not eat are called non edible seeds.

Ex:-  Apple seeds ,  lemon seeds

31:- What is germination?

Ans:- The process by which new plants grow from the seed is called germination.

 

The world of animals, chapter-3, class-3, science

 

1:- In how many categories animals are divided?

Ans:- Animals are divided into two categories.

1-Vertebrate

2-Invertebrate

2:- What is vertebrate?

Ans:- Animals that have back bone is called vertebrate.

For example:-  fish ,bird, humans

3:- What are invertebrate animals?

Ans:-Those animals that do not have back bone is called invertebrate .

For example:- amoeba, jelly fish, earth worm, round worms, snails, Insects, star fish.

4:- What is the other name of backbone?

Ans:-  spinal  column

5:- In  how  many  parts  the  body  of  insects  divided ?

Ans:- An  insect’s  body  is  divided  into  three  parts. 

1-Head

2-Thorex

3-Abdomen

6:- Who  helps  insects  to  sense  things  around  us?

Ans:-  Two  antennae

7:- How many legs an insect have?

Ans:-An insert has six legs.

8:-Write two insects that only crawl.

Ans:-ants and cockroaches

9:-Write two insects  that can fly?

Ans :- Butterfly  and mosquito

10:- Write an insects that use their hind legs to hop and wings to fly

Ans :-grasshopper

11:- Write an insect that have a long hollow tube in the mouth.

Ans:-Butter fly

12:- What are spiracles?

Ans:-insects have holes on their  bodies to breath are called spiracles .

13:- How do insects reproduce their young ones?

Ans:-Insects reproduce their  young ones by laying  eggs.

14:- In how many groups vertebrates are divided?

Ans :- Vertebrates are divided into five groups.

(1)    Fish

(2)    Amphibians

(3)    Reptiles

(4)    Birds

(5)    Mammals.

15:- What are amphibians?

Ans:- Animals which live both on land and in water is called amphibians.

For example- frog , tortoise, snake, crocodile, hippopotamus.

16:- What are mammals?

Ans:- Those animals that give to birth their young ones and feed milk from their own body are called mammals.

                         For example - cow, buffalo, tiger, lion etc.

17:- What are reptiles?

Ans:- Those animals that have cold blood and get warmth from environment are called reptiles.

                         Ex- Lizard, crocodile, snake,tortoise etc.

18:- What are bird? Write example.

Ans:- Those warm blooded animals that have feathers and wings to fly are called birds.

For example- pigeons, crow ,owl, parrot.

19:- What are fish?

Ans:- Those cold blooded animals that have gills and fins to survive in water are called fish.

                         For example - dolphin, shark etc.

20:- How does fish swim in water?

Ans:- Fish swims in water with the help of fins and tail.

21:- How does fish breath in water?

Ans:- Fish breath in water by a special organ called gills.

22:- How does frog swim in water and jump on land?

Ans:- The frog swims in water with the help of webbed feet and jump on the ground with the help of hind limbs.

23:- How does snake move on the ground?

Ans:- Snake have scales or plates on the under side of their body. These scales are made of very strong muscles which help the snake to move on ground.

24:- Write short notes on birds.

Ans:- Birds have wings instead of arms which help them to fly. Their bodies are covered with feathers. Birds have thin and hollow bones which make their body light. The shape of their body is just like aeroplane that helps them to fly.

25:- Write three bird which can not fly?

Ans:-  Penguin,  kiwi, ostrich

26:- How does duck swim in water?

Ans:- Duck has webbed feet that helps them to swim in water.

27:- How many types  of limbs mammals  have?

Ans- mammels have two types of limbs

                         1-Fore limbs

                         2-Hind limbs

27:-How many fore  limbs mammals have

Ans-mammals have two fore limbs.

28:- How many hind limbs mammals have ?

Ans –mammals  have two hind limbs.

29:- Write two name of mammals that live in water.

Ans:- Whales  and dolphins.

30:- How do frogs catch  the  small insects to eat?

Ans-frogs catch the small insects by shooting out their long sticky tongue directly on insects .

31:- Who  do  not   chew  the  food  and  directly  sallow  their   food  as  a  whole?

Ans-snake

32:- Write two names of reptiles that eat insect by trapping with the help of their long sticky tongue.

Ans:- Lizard and chameleon

33:- Write two name of flash eating bird.

Ans:- Eagle and peacock

34:- Write two name of grains eating bird.

Ans:- Sparrow And pigeon.

35:- Who help the birds to eat?

Ans:- Beaks help the bird to eat.

36:- What does a bird use  to catch food and also to protect themselves?

Ans:- Birds have Claws to catch food and also to protect themselves from enemies.

37:- Write five name of mammals that are herbivores.

Ans:-               cow, Rabbit, Elephant, Deer, Horse

38:- Write  five name of mammals that are carnivorous

Ans:-     Lion, Fox, Jackle, cheetah, Tiger

39:- Write four name of mammals that are omnivores.

Ans:- Humans, Bear, Cat, Dog

40:- Who helps the fish to breath under water?

Ans:- Gills helps the fish to breathe under water.

41:- What is the breathing system of amphibians on land and in water?

Ans:- Amphibians breath on land with the help of lungs but they breath in water with their moist skin.

42:- Who helps the reptiles and birds to breath?

Ans:- Reptiles and birds breath with the help of lungs.

43:- Who helps the mammal in breathing?

Ans:- Mammals breathe with the help of lungs.

44:- How do dolphin and whales breaths in water?

Ans:- Dolphin and whales have lungs they come to the surface of water to inhale fresh air. They breathe through nostrils called blow holes.

45:- Who help the fish to find food and know about danger?

Ans:- Fish can feel vibrations in water  which help them to find food and know about danger.

46:- Write a name of living being which can see the sides and behind without moving?

Ans:- Frog

47:- Which organ help the snake to smell?

Ans:- snake have poor eye sight. They use their tongue to smell the surrounding.
48:- How many sense organs human beings have?
Ans:- Human beings have five sense organs-eyes, ears, nose, tongue, and skin.
49:-Who help us to see?
Ans:- Eyes help us to see.
50:- What is the functions of ears in our body?
Ans:- Ears help us to hear and also maintain our balance.
51:- What is the functions of nose in our body?
Ans:- Nose helps us to smell and breathe.
52:- What is the functions of tongue in our body?
Ans:- tongue helps us to taste food and helps us to speak.
53:- What is the functions of skin in our body?
Ans:- skin helps us to feel the heat, cold and pain.
54:- How does fish reproduce?
Ans:- Fish reproduce by laying eggs in water.
55:- How do amphibians reproduce their young ones?
Ans:- amphibians reproduce their young ones by laying eggs.
56:- What is tadpole?
Ans:- The baby frog is called tadpole.
57:- How do birds reproduce their young ones?
Ans:- Birds reproduce their young ones by laying eggs.
58:- How do mammals reproduce their young ones?
Ans:- Mammals reproduce their young ones by laying eggs. 

 

Human body-organ system, chapter-4, class-3, science

 

 

 

1:- Which is the smallest unit of the human body ?

Ans:- Cells are the smallest unit of human body.

2:-How do tissues form?

Ans:- Tissues are formed when similar types of cells combined together.

3:-How do organs form?

Ans:- Organs are formed when different  types of tissues combined together.

4:-Write four name of organs of our body?

Ans:- Stomach, Liver, Lungs and Ear.

5:-What is skeletal system?

Ans:- The system of our body that is made of bones is called skeletal system.

6:- How many bones are found  in an adult human body?

Ans:- There are 206 bones in adult human body.

7:-How many bones are found in  young ones ?

Ans:- Young ones have more than 300 bones.

8:-write two functions of skeletal system.

Ans:- The two function of skeletal system are

1-skeletal system gives shape and support to the body.

2-skeletal system protects the very delicate parts inside our body like –lungs ,brain ,heart etc.

9:-How many main parts of skeletal system ? Name them.

 Ans:-There are four main parts of skeletal system .

1-skull

2-ribcage

3-backbone

10:- What is muscular system?

Ans:- The system that helps us in the movement of our body is known as the muscular system.

11:- What are muscles?

Ans:- Muscles are stretchy bands of tissue. Muscles are joined to the bones.

12:- Write five functions of muscles.

Ans:- The five functions of muscles are

1-Muscles help us in blinking eyelid.

2-muscles help us to move from one place to another with the help of bones.

3-Internal organs move because of muscles.

4- Our heart keeps beating because of muscles.

5- food we eat moves through our body because of muscles.

13:- What is digestion?

Ans:- The food that we eat cannot be used by our body directly. The process by which food is broken down into simple useful substances that can be used by the body to get energy is called digestion.

14:- Write all the organs that made our digestive system.

Ans:- mouth, food pipe, stomach, small intestine, large intestine and anus.

15:- What is the function of digestive system?

Ans:- Digestive system helps the body to break down and digest the food we eat, so that we get energy to work and play.

16:- Write the name of all organs that constitute circulatory system.

Ans:- The heart, blood and blood vessels make up the circulatory system.

17:- Who helps to pump blood in our body?

Ans:- Heart pumps blood to all parts of our body.

18:- What are blood vessels?

Ans:- The thin tubes in our body that carry blood from one part to another is called blood vessels.

19:- Who carries nutrients and gasses like oxygen and carbon dioxide in our body?

Ans:- Blood carries nutrients and gasses like oxygen and carbon dioxide in our body.

20:- What is Respiratory system?

Ans:- The system of the body that helps us in breathing is called respiratory system.

21:- Write the name of all organs that constitute respiratory system?

Ans:- Nose, windpipe and lungs

22:- How does the respiratory system work? Explain it.

Ans:- respiratory system helps us to breathe. We breathe in air through nose. The air then goes down through the wind pipe and reaches to the lungs.

23:- What is inhaled air?

Ans:- The air we breathe in is called inhaled air.

24:- What is exhaled air?

Ans:- The air we breathe out is called exhaled air.

25:- What is nervous system?

Ans:- The system that helps us to think, act, and learn is called nervous system. It sends message to the brain and receives message from the brain.

26:- Write all the organs that constitute nervous system.

Ans:- The organs that constitute nervous system are brain, spinal cord and nerves.

27:- Who is the main organ of the nervous system?

Ans:- Brain is the main organ of the nervous system.

28:- What is brain?

Ans:- brain is the main organ of nervous system that controls all the other organs by sending and receiving information from all parts of the body.

29:- Who helps us to think, act and learn?

Ans:- Nervous system helps us to think, act and learn.

30:- How many sense organs in our body? Name them.

Ans:- There are five sense organs in our body.

                1-eyes

                2-ears

                3-nose

                4-tongue

                5-skin

31:- What is the function of eyes?

Ans:- Eyes help us to see things.

32:- What is the function of ears?

Ans:- Ears help us to hear. It also helps us to maintain the balance of our body.

33:- What is the functions of nose?

Ans:- Nose helps us to breathe. It also helps us to smell.

34:- What is the function of tongue?

Ans:- Tongue helps us to taste. It also helps us to speak.

35:- What is the function of skin?

Ans:- Skin helps us to feel like hot, cold, or pain etc.

36:- What is excretory system?

Ans:- The organ system that removes wastes like urine, carbon dioxide, swet etc. from our body is called excretory system.

37:- Write the name of main organs of excretory system.

Ans:- The main organs of excretory system are kidneys, lungs and skin.

38:- Who expels out urin from our body?

Ans:- kidneys

39:- Who helps us to get rid of carbon dioxide from our body?

Ans:- lungs

40:-Who  helps us to get rid of swet from our body?

Ans:- skin

 

Birds: food and more, chapter-5, class-3, science

 

1:- Who have wings and body covered with feathers?

Ans:- Birds have wings and body covered with feathers.

2:- Write five birds that commonly seen in our environment.

Ans:- pigeon, crow, sparrow, hen, and parrot

3:- Write the main parts of body of a bird?

Ans:- The bird has a beak, two wings, feathers, two eyes, two ears, two legs and a tail.

4:- Which bird has sharp eyesight to find the food?

Ans:- Flesh-eating birds

5:- Write five uses of beak of bird.

Ans:- The five uses of beak of bird are

1-The bird breathes through tiny opening on its beak.

2-Bird uses their beak to pick up food and break it into tiny bits.

3-Bird uses their beak beak to feed their baby.

4-Bird uses their beak for preening.

5-Birds use their beak to protect themselves and to build their nests.

6:- What is the shape of eagle's or vulture's beak? And write its uses.

Ans:- They have strong and sharp beak. Which is shaped like a hook. It helps them to tear the flesh.

7:- What is the shape of kingfisher's or pelican's beak? And write its uses.

Ans:-They have long scissor-like beak. It helps them in catching small fish.

8:- What is the shape of swallow's beak? And write its uses.

Ans:-swallow is an insect eating bird. There for swallow has short and broad beak. It helps them to trap insects while flying.

9:- What is the shape of parrot's beak? And write its uses.

Ans:- parrot has strong, curved beak. It helps them to crack nuts and seeds.

10:- What is the shape of duck's beak? And write its uses.

Ans:- Ducks have broad beak with holes. It helps them to eat water plants and insects.

11:- What is the shape of sparrow's beak? And write its uses.

Ans:- Sparrow has a short, pointed, and strong beak. It helps to crack seeds and eat insects

12:- What is the uses of feathers of bird?

Ans:- The uses of feathers of birds are

1-feathers of birds keep them warm during cold weather.

2-Feathers of birds protect them from rain as serve like raincoat.

3-Feathers of birds also protect them in summer season from extreme hot.

13:- How many types of feathers? Name them.

Ans:- There are three types of feathers

1-body feathers

2-flight feathers

3-down feathers

14:- What are body feathers?

Ans:- Bird's body is covered with small feathers. These feathers are called body feathers.

15:- What are flight feathers?

Ans:- The long and flat wings of birds that help in flying is called flight feathers.

16:- What are down feathers?

Ans:- The small and fluffy feathers that found under the flight feathers are called down feathers.

17:- Write four features of birds which help them to fly.

Ana:- The four features of birds that help them to fly are

1-The body of a bird is boat shaped so that it can float in the air just like a boat floats on water.

2-Bones of birds are thin, hollow and filled with air, which make the body light so that they can fly.

3-Birds have wings made of feathers which help the birds to fly.

4-Birds have tails. Which help the birds to change direction during flying.

18:- What are flight muscles?

Ans:- The wings of birds have strong muscles. These are called flight muscles. The flight muscles help to move the wings.

19:- What are flightless birds? Give example.

Ans:- Those birds which cannot fly because of heavy bodies are called flightless birds.

For example:- Ostrich, emu, cassowary, rhea etc.

20:-Write three name of birds that can fly only short distance.

Ans:- Hen, turkey, peacock

21:-Write two name of birds that can fly at very low height.

Ans:- Sparrow and mynah

22:-Write three birds that fly at a great height.

Ans:- Eagle, vulture and kite

23:-What are preying birds?

Ans:- Those birds which have a sharp eyesight at a great height to see the prey on the ground are called preying birds. The other name of preying birds are birds of prey.

For example:- eagle, vulture and kite

24:-How do the birds use their feet and claws?

Ans:- Birds use their feet and claws to catch food, to protect them and to sit on the tree branches.

25:-How do the feet and claws of ducks and swan help them in swimming?

Ans:- Ducks and swan have three toes in front and one toe at the back. The front toes are joined together by skin called web. Such feet are called webbed feet. These webbed feet help the birds to swim by pushing the water backwards.

26:- How do feet and claws help the climbing birds?

Ans:- climbing birds like parrot and woodpecker have two toes that point forward and two toes that point backwards. Such toes help them in climbing trees.

27:- How do the feet and claws help the perching birds?

Ans:- Perching birds like crow, sparrow and mynah have three toes infront and one toe at the back. They use their toes to perch on high branches without falling even while sleeping.

28:-How do the feet and claws help the wading birds?

Ans:- Wading birds like cranes and herons have long and thin legs. They spread their toes that prevent the birds from sinking into the muddy water. These help them to move on muddy water easily. This movement is called wading.

29:-How do the feet and claws help the scratching birds?

Ans:- Scratching birds like rooster and peacock have hard and sharp claws. Their hard claws help them to scratch and dig the ground and pull out insects and worm.

30:- What are talons?

Ans:- The strong and sharp claws of flesh eating birds are called talons.

31:- How do the feet and claws help the preying birds?

Ans:- Preying birds like eagles and hawks have strong and sharp claws called talons. They use their talons to catch live rats, toads and other small animals.

32:- how does the bird fly in air? write their process.
Ans:- The bird first flaps its wings up and down to rise up in the air. When it reaches the desired height, it stops flapping its wings and simply glides through the air.

33:- How many types of flapping movements a bird have while flying?
Ans:- There are two types of flapping movement.
1-upstroke
2-downstrokes

34:- What is upstroke?
Ans:- When the birds move their wings upward and backward. this type of movement is called upstroke.

35:- What is downstroke?
Ans:- When the birds move their wings downward and forward. this type of movement is called downstroke.

36:- write the name of seven materials that is used by birds to build their nests.
Ans:-  Twigs, grass, feathers, cotton, wool, leaves, and mud

37:- Write three uses of nests for birds.
Ans:- the three uses of nests for birds are
1-Nests keep the birds safe from bad weather.
2-Nests protect the bird from enemies.
3-Birds lay their eggs in nests and take care of their young ones.

38:- Who makes a hole in a tree trunk with its beak for nest.
Ans:- woodpecker

39:- Who make their nests on the highest branches of tall trees or on rocks?
Ans:- Eagles

40:- Who uses grass, twigs, and leaves to weave a nest on a tree with its beak?
Ans:- Weaver bird

41:- Who makes its nest using large sized leaves and stitch the leaves using cotton thread with the help of beak?
Ans:- tailor bird

42:- Who make their nests on ground with the help of few stones and pebbles?
Ans:- penguins and partridges

43:- How do the birds help us? write three ways.
Ans:- The three ways  by which birds help us are
1- some birds protect our crops by eating harmful insects.
2-Some birds help us in spreading seeds so that more plants can grow
3-Some birds keep our environment clean by feeding the dead remains of animals.