Given below are a few statements related to external fertilisation. 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 fertilisation
iv. Offspring formed as a result of external fertilisation have a better chance of survival than those formed inside an organism
(a) iii and iv (b) i and iii (c) ii and iv (d) i and iv
Ans: The answer is the option (b), (i) and (iii)
Explanation: Fertilisation requires both the gametes to be released simultaneously. A medium is needed by Male gametes to travel to the female gametes. Water is the medium in most cases. Air also acts as the medium in some cases.