Question

what do you men by fertilization ? differentiate between external and internal fertilization?

Answer 1

Fertilization is the process of the fusion of the male gamete with the female gamete which results in the formation of a new organism. There are two types of fertilization:

1. External fertilization:

External fertilization may be defined as the process in which the fusion of the male gamete and the female gamete occurs outside the body of the female organism. Moist environment is a necessary condition for this type of fertilization to happen so that the gametes (both male and female) do not dry out. For example: External fertilization is shown by Hydra, salmon, sea urchins, starfish, clams etc.  

2. Internal fertilization:

Internal fertilization may be defined as the process in which the fusion of the male gamete and the female gamete occurs inside the body of the female organism. This type of fertilization is independent of its environment. For example: In human being the offspring is formed as the result of internal fertilization. Other examples are monkeys, cats, dogs, rats, etc. 



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Answer 2

The process of fertilizing an egg involving the fusion of male and female gamets to form zygote is called fertilization .

External fertilization-: which takes place outside the female body.

lnternal fertilization-: which takes place outside the female body.

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