What is a keystone species?

Biology Ecosystem Structure and Function, Productivity and Decomposition Single Correct MCQ

Published on: August 12, 2026

A common species that has plenty of biomass, yet has a fairly low impact on the community's organization

A rare species that has minimal impact on the biomass and on other species in the community

A dominant species that constitutes a large proportion of the biomass and which affects many other species

A species which makes up only a small proportion of the total biomass of a community, yet has a huge impact on the community's organization and survival

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The correct answer is:

A keystone species performs a unique ecological role that maintains the balance of its entire habitat, despite its low population size. If this species is removed, the ecosystem often undergoes a radical shift or collapse.

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