Page 25 - ACTIVE SCIENCE 4 TOC

3. Animals which give birth to young ones and feed them with their milk are called
______________.
4. The larva of a butterfly that develops into a ______________.

5. The frog’s egg develop into ______________.

LET’S
REVISE

• Living things cannot live forever. They die after completing their life span.

• The parent animals sit on their young ones to keep them warm.
• Frog’s eggs look like a huge bunch of jelly.

• Frog’s eggs develop into a tadpole.

• The larva that comes out from the eggs of grasshoppers and cockroaches is called
nymph. They resemble their parents. After moulting many times, it converts into an
adult. Let’s Pronounce Together

• Animals which give birth to young ones and feed
them with their own milk are called mammals. incubation metamorphosis
caterpillar embryo
• Butterflies lay their eggs on leaves of plants. The nymph mammals
larva that comes out eats these leaves to grow. pupa yolk

Glossary
• Reproduction : Some animals give birth to their young ones and some
lay eggs.

• Oviparous animals : Animals that lay eggs for reproduction.
• Incubation : The parent animals sit on their young ones to keep
them warm.

• Spawn : A huge bunch of jelly-like frog eggs.

• Life cycle of an animal : The stages of development from an embryo to an adult.
• Albumen : The jelly-like white coloured material inside the egg shell.

• Mammals : Animals which give birth to young ones and feed them
with their milk.
• Metamorphosis : The transformation process from a young one to an adult.

• Moulting : Shedding of old skin by an animal.
• Yolk : The yellow-part inside the albumen.

• Nymph : The larva that comes out from their eggs.

32 Active Science-4