Class IV: Science [Ch-3 Animals and Their Babies]

Define the terms

1. Air cell- The air space formed when the content of the egg cools and contracts after the egg is laid.

2. Albumen- The clear inside part of an egg that turns white when we cook it.

Answer in one line

1. Where does a butterfly lay the eggs?

Ans. A female butterfly lays her eggs on leaves.

2. How do snakes protect their eggs and babies?

Ans. Snakes protect their eggs and babies, by coiling around them.

3. What is vitelline membrane?

Ans. The clear casing that encloses the yolk is called vitelline membrane.

4. How many stages does a dragonfly have in its life cycle? Name them

 Ans. There are three stages in dragon fly’s life cycle. That is- Egg, Nymph, adult dragonfly.

5. What is eggshell made of ?

Ans. Egg shell is made up of calcium carbonate.

Answer in short

1. What is metamorphosis?

Ans. The change in the form and habitat of an animal during normal development after the embryonic stage is called metamorphosis.

2. How do birds protect their babies?

Ans. Birds build nests to protect their eggs and babies from bad weather and predators.

    3. What is reproduction?

Ans. The process in which animals produce more of their own kind by either eggs or giving birth to young ones.

Answer in detail

1. How are mammals different from egg laying animals?

Ans. Mammals:

Animals that give birth to young ones are called mammals.

Eg- cow, dog.

Egg laying animals:

Animals which lay eggs and and hatch their young ones are called egg laying animals.

Eg- fish, frog, birds.

2. What are the stages of a butterfly life cycle?

Ans. A butterfly has four stages in its lifecycle-

i) Eggs- Female butterflies lay eggs on leaves.

ii) Caterpillar- From eggs tiny warm like creature known as caterpillar comes out. It feeds on leaves and grows in size.

iii) Pupa- Caterpillar turns itself into pupa by building a hard case around it to protect itself.

iv) Butterfly- A few days later the case around the pupa splits open and an adult butterfly comes out.

3. What are the stages of a frog's life cycle?

Ans. A frog has four stage in his lifecycle.

i) Egg: Frogs lay their eggs in water. A floating clumps of eggs is called frog spawn.

ii) Tadpole: When the eggs hatch, tadpole emerge. They are the larvae of the frog.

iii) Young frog- The juvenile frog grows from legs and its tail gradually becomes shorter until it no longer there.

iv) Adult frog- As the frog develops into an adult, it will began to eat insects rather than vegetation. It can take up to four year before the frog becomes fully mature.

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