Question

Given below are a few statements related to external fertilization. Choose the correct statements.

i. The male and female gametes are formed and released simultaneously.

ii. Only a few gametes are released into the medium.

iii. Water is the medium in a majority of organisms exhibiting external fertilization.

iv. Offspring formed as a result of external fertilization have a better chance of survival than those formed inside an organism.

• A. i and iii
• B. i and iv
• C. iii and iv
• D. ii and iv

Answer 1

The correct option is A i and iii

Features of external fertilisation:

External fertilisation occurs when syngamy occurs outside the body of an organism. The following are the features of external fertilisation:-

● Both the parents release gametes in large numbers at the same time increasing the probability of fertilisation.

● It mostly occurs in certain fishes (bony fishes) and amphibians where the gametes are released into the surrounding water.

● Embryo is exposed to the harsh environment, therefore, the offspring are not protected as in internal fertilisation.



Final answer:

(b) i and iii