Animals reproduce by either laying eggs or giving birth. Birds exclusively reproduce through egg laying. Some parent animals incubate their eggs by sitting on them to keep them warm. Eggs have a protective shell, inside of which is an albumen containing protein and a yolk containing nutrients for embryo development. The embryo develops into a chick. An animal's life cycle involves various developmental stages from embryo to adult. Frogs lay eggs that hatch into tadpoles, which undergo metamorphosis to grow legs and lose their tails before becoming adults. Butterflies lay eggs that hatch into caterpillars, which form cocoons and pupate before emerging as adult butterflies.

1. Animals and their young ones
www.reflectivelearn.com

2. Reproduction
 Animals produce more of their own kind by either
laying eggs or giving birth to young ones. This is
called reproduction.
 All birds reproduce by laying eggs.
 The habit of sitting on their eggs by some parent
animals to keep them warm is called incubation.
www.reflectivelearn.com

3. Part of an egg
 An egg has a thin protective shell called “Egg
Shell“.
 Within the egg shell is a white jelly like substance
called the albumen, which is rich in proteins.
 The yellow inner part of the egg is the yolk and it is
rich in fats, vitamins and minerals.
 The yolk contains food for the growing baby or
the embryo.
 The embryo develops into a chick.
Parts Of an Eggwww.reflectivelearn.com

4. Life cycle
 Various stages of development, from an embryo to
a mature adult, is called the cycle of an animal.
www.reflectivelearn.com

5. Life cycle of frog
 A frog lays egg in large clusters called spawns.
 A tadpole hatches out of the egg.
 A tadpole undergo several changes such as – it
grows legs and loses its tail before it becomes an
adult. This process is called metamorphosis.
 A complete change from a young form to adult is called
metamorphosis.
www.reflectivelearn.com

6. Life cycle of butterfly
 An adult butterfly lay eggs.
 The egg hatches into larva
called caterpillar.
 The caterpillar builds a
cocoon around itself to form a
pupa.
 The pupa sheds its skin many
times to become an adult
butterfly.
Process of shedding the old skin
is called moulting
www.reflectivelearn.com