Page 17 - Science class 4

days, they start growing legs. This is called a
Tadpole
metamorph. A metamorph grows into a young
frog which looks more like its parent. The adult

frog does not have a tail. It lives on land and
Eggs Metamorph
reproduces in water.

Quenching Scientific Thirst
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Frog
The process of change of a tadpole into
an adult is called metamorphosis.
Life-cycle of a frog
Insects
All insects develop from eggs. Some insects like
cockroaches and grasshoppers pass through three
Grasshopper Butterfly
stages (egg, nymph and adult) in their life-cycle.
Other insects like butterflies and houseflies pass

through four stages (egg, larva, pupa and adult) in
Cockroach Housefly
their life-cycle.
Fact File
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Fact File
¤ The smallest living mammal is a shrew with a body about 2 inches
long.
¤ The young one of grasshopper is called nymph that resembles its
parent just after hatching.

Scientific Terms
Embryo : a young organism in the first stage of development
Hatching : to lay eggs and keep them warm

Life cycle : various stages of development of a living being
Metamorphosis : the rapid transformation from larva to adult form

Nymp : an insect that comes out from an egg
Tadpole : larva of frog

Chapter at a Glance

³ All animals produce young ones of their own kind but the ways are different.
³ Some animals give birth to young ones and others lay eggs.
³ Some animals take care of their young ones while others do not.

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