A keystone species is an organism that helps define an entire ecosystem. Without its keystone species, the ecosystem would be dramatically different or cease to exist altogether.
What is a keystone species?
NEET UG 2004 — Zoology Organisms and Populations
2004mcqmedium
What is a keystone species?
Official previous-year question
Held on 30 Apr 2004 · Verified 9 Jul 2026.
Options
- A
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
- B
A common species that has plenty of biomass, yet has a fairly low impact on the community's organization
- C
A rare species that has minimal impact on the biomass and on other species in the community
- D
A dominant species that constitutes a large proportion of the biomass and which affects many other species.
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