Question

Keystone species are

• A. Species belonging to same period.
• B. Species that determine structure of biotic community.
• C. Species reproducing sexually.
• D. Species recorded only in the fossil state.

Answer 1

The correct option is B Species that determine structure of biotic community.

A keystone species is a species, that plays a critical role in maintaining the structure of an ecological community and whose impact on the community is greater than would be expected based on its relative abundance or total biomass.
So, answer is- 'Species that determine structure of biotic community'.