Which of these characteristics belong to organisms showing internal fertilisation?
(a) Egg is formed inside the female body where they fuse with the male gamete.
(b) Male gamete is mostly motile.
(c) Number of eggs produced is less in number.

detailed solution

Correct option is D

When syngamy occurs inside the body of the organism, hence the process is called internal fertilisation. In all these organisms, egg is formed inside the female body where they fuse with the male gamete. In organisms exhibiting internal fertilisation, the male gamete is motile and has to reach the egg in order to fuse with it. In these even though the number of sperms produced is very large, there is a significant reduction in the number of eggs produced. In seed plants, however, the non-motile male gametes are carried to female gamete by pollen tubes.