Summary of chapter -Animals and their young ones of class IV , CBSE,www.learnroots.com

1. Animals and their young ones
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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.
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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.
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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.
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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
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