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NCERT Solutions for Class 8th Science


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Chapter 9. Reproduction in animals

Chapter Review




Chapter Review:

  • The production of a new individual from parents body is known as reproduction.
  • The fusion of male and female gametes is called sexual reproduction.

  • The production of new individual by the involving of only single parent is called asexual reproduction. 

  • Reproduction resulting from the fusion of male and female gametes is called sexual reproduction.

  • Sperms are male gametes which are produced by testis. 

  • Ovum is female gamete which is produced by female organ ovary.
  • The reproductive organs in male include testes, sperm ducts and penis.
  • The reproductive organs in the female include ovaries, oviducts and uterus.
  • Fusion of male gametes sperms and female gametes ovum is called fertilization. 
  • Fertilised egg is known as zygote. 
  • ​The stage of the embryo in which all the body parts can be identified is called a foetus.
  • Fertilization which takes place inside the female body is called internal fertilization.It occurs in many animals including humans, cows, dogs and hens.
  • Fertilization in which the fusion of a male and a female gamete takes place outside the body of the female is called external fertilization.It occurs in aquatic animals such as fish, starfish, etc.
  • The animals which give birth to young ones are called viviparous animals.
  • Those animals which lay eggs are called oviparous animals.

  • Reproduction in which an animal reproduces by dividing into two individuals is called binary fission.It occurs in amoeba. 

  • New individuals develop from the buds in hydra, this type of asexual reproduction is called budding.
  • The transformation of the larva into an adult through drastic changes is called metamorphosis.


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