NCERT Class VIII Science Solutions: Chapter 9-Reproduction in Animals Part 3

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Question 8:

What is metamorphosis? Give examples.

Answer:

The transformation of the larva into an adult through drastic changes is called metamorphosis. Metamorphosis is a biological process which involves sudden and abrupt changes in the body structure of the animal by cell growth and differentiation. It is generally observed in amphibians and insects.

Examples: frogs and butterflies.

This picture shows stages of complete metamorphosis

Stages of Complete Metamorphosis

Question 9:

Differentiate between internal fertilization and external fertilization.

Answer:

Difference between Internal and External Fertilization
Difference between internal and external fertilization

S. No.

Internal Fertilization

External Fertilization

1.

Fusion of male and female gametes take place inside the body.

Fusion of male and female gametes take place outside the body.

2.

Less numbers of eggs are produced.

Large numbers of eggs are produced.

3.

Examples: Cow, Dog, Human etc.

Examples: Frog, Fishes etc.

Question 10:

Complete the cross-word puzzle using the hints given below.

Across:

  • The process of the fusion of the gametes.

  • The type of fertilization in hen.

  • The term used for bulges observed on the sides of the body of Hydra.

  • Eggs are produced here.

Down:

  • Sperms are produced in these male reproductive organs.

  • Another term for the fertilized egg.

  • These animals lay eggs.

  • A type of fission in amoeba.

Answer:

Across:

  • Fertilization

  • Internal

  • Buds

  • Ovary

Down:

  • Testis

  • Zygote

  • Oviparous

  • Binary

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