Page 8 - K-2174 Science (Final) (26-04-18) Light

4. Life cycle of a butterfly :

(i) A butterfly lays hundreds of eggs at a time.

(ii) The eggs hatch into young

ones. They are called

caterpillars.

(iii) A f t e r f e w d a y s , t h e Adult butterfly

caterpillar builds a cocoon

around itself to form pupa.

During this period, it sheds

its skin several times. This Pupa Eggs
is called moulting.

(iv) After a few days, adult

butterfly comes out from Caterpillar
the cocoon.
5. Life cycle of a frog : Life cycle of a butterfly

(i) A female frog lays a cluster

of eggs in a safe place in water. The cluster of eggs is called spawn.

(ii) The baby frogs come out

of the eggs in about three

weeks. They are called

tadpole. They look like tiny

fish and breathe through Adult frog
gills.

(iii)Later, the tadpoles lose their Cluster of

tails and develop legs. eggs

(iv)After a specific period of

time, they become adult

frogs. Tadpole
6. In mammals, babies are formed Life cycle of a frog

inside the body of the mother.

They stay there for several weeks and then are born. At the time of

the birth, the babies are weak and helpless. So, mothers care for their

babies. They feed their babies with their own milk. They clean them,

teach them to find food and to live on their own. They protect them till

they learn to look after themselves. For example; a mother kangaroo

keeps its baby in its pouch and it develops there.

C. 1. The eggs of fish and frogs do not have a hard protective cell like the

eggs of birds or reptiles. So, they have to lay their eggs in water and

they cannot reproduce in the absence of water.

2. Birds sit on their eggs for some time to provide them warmth.

3. Dolphin.

4. Since tadpoles breathe through gills, they cannot live on land. For

living on land, an animal needs lungs.

8 Science 4