Question

How can we say that fish exhibits external fertilisation?


NCERT Class VIII
Science - Exemplar Problems

Chapter 9. Reproduction in Animals

Answer 1

FISH EXHIBITS EXTERNAL FERTILIZATION SINCE IT LAYS EGGS WHICH GET FERTILIZED WITH THE MALE FISH SPERMS INSIDE THE WATER OUTSIDE THE FEMALE FISH'S BODY.

Answer 2

External fertilization is a kind of fertilization where eggs are released into the environment in order to be fertilized by the male. In this kind of fertilization, a moist, as opposed to dry, environment is necessary. This is true for two reasons: the first reason is that the gametes, which are just reproductive cells, the sperm and eggs, can dry out and become non-functional in a dry environment. The second reason is that a moist environment allows the sperm to move towards the eggs in order to fertilize them.