(a) Birds

(b) Primates

(c) Reptiles

(d) Amphibians

4. Ans: a

Explanation:

Ceylon frogmouth, Coppersmith Barbet, Gray-chinned minivet and White-throated redstart  are included as SCHEDULE — I  species in Section B (Birds) of  Wildlife Protection Act.

Hence, option a is correct.

Read: Previous Year UPSC Environment Questions (PYQs) With Explanation 2020