NCERT Solutions for Class 8th Science
Chapter 9. Reproduction in animals
- 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.