Question

Define external fertilisation. Mention its disadvantages.


NCERT Class XII
Biology - Main Course Book

Chapter 1. Reproduction

Answer 1

EXTERNAL FERTILISATION IS THE PROCESS IN WHICH THE OVARIES FUSE WITH THE TESTIS OUTSIDE THE BODY
THE EGGS AMY BE EATEN BY OTHER ANIMALS

Answer 2

External Fertilization is the process in which the fusion of the male and the female gamete takes place outside the female body in an external medium , generally water .Fish ,Frog,Starfish are some organism that exhibit external fertilization.
Disadvantages of External Fertilization
In external fertilization, egg has less chance of fertilization .This can lead to the wastage of a large number of eggs produced during process.
Further.there is an absence of proper parental care to the offspring , which results in a low rate of survival in the progenies