Question

What is fertilisation? Define it's types also.

Answer 1

Answer:

Fertilization is the process by which the male and female gametes fuse to form the zygote. There are two types of fertilization-

External fertilization- It is the fertilization where the eggs are fertilized outside the body of the organisms.

Internal Fertilization- where the eggs are fertilized inside the body.

Answer 2

Answer:

The process of fusion of sperm with egg (ovum) to produce zygote is called fertilization.

fertilization is of two types – internal and external fertilizations.

1. In sexual reproduction, the male inserts the sperms into the female reproductive tract to fuse with the egg. If the fusion takes place within the female parent, it is called internal fertilization. In humans, most of the animals like cats, lions, pigs, dogs, hens, etc., the fusion of gametes takes place internally. In this type, a zygote is formed within the mother and gets its nourishment from her.
2. When the fusion of sperm and egg takes place outside the female parent, it is called external fertilization. Only a minority of organisms exhibit this type of gamete fusion. For example, fish, frogs, etc. Here the female parent deposits her eggs in a place and later, the male parent ejects his sperms over them, then fusion takes place.
4. Gametes that fuse externally has to face many challenges. Since eggs and sperms are deposited in the external environment, the chances of fusion are very less. Predators may eat eggs and the zygote that is formed. To compensate this loss, organisms like fish and frogs lay hundreds of eggs at a time.

Explanation:

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