Question

Which among the following is a keystone species?

• A. Human being
• B. Parrotfish
• C. Kashmir stag
• D. Passenger pigeon

Answer 1

The correct option is B

Parrotfish

Keystone species are those species that play a crucial role in the functioning of an ecosystem. They typically have a relatively large positive impact on an ecosystem while being relatively small in abundance. Although human beings are highly abundant in number, the impact that we have on the ecosystem cannot be considered crucial and positive. Parrotfish on the other hand, is the only species of fish that cleans the corals, which in turn has become home for thousands of species. Parrotfish is hence, a good example of keystone species.