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.