Internal fertilisation takes place in :

a- Birds

b-Amphibians

c- Mammals

d- Gymnosperms

e-Angiosperms

a,c,d and e

The correct answer is Option (3) – a,c,d and e

In many terrestrial organisms, belonging to fungi, higher animals such as reptiles, birds, mammals and in a majority of plants (bryophytes, pteridophytes, gymnosperms and angiosperms), 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 most aquatic organisms, such as a majority of algae and fishes as well as amphibians, syngamy occurs in the external medium (water), i.e., outside the body of the organism. This type of gametic fusion is called external fertilisation.