A) A rare species that has minimal impact on biomass and on other species in community
B) A dominant species that constitutes a large proportion of biomass, which affects many other species
C) A common species that has plenty of biomass, yet has a fairly low impact on the communitys organization
D) A species which makes up only a small proportion of the total biomass of a community, yet has a huge impact on the communitys organization and survival
Correct Answer: D
Solution :
Key stone species means, a species which makes uponly a small proportion of the total biomass of a community, yet has a huge impact on the communitys organization and survival e.g., elephants damage trees by browsing the lower branches, stripping the bark and uprooting them. It prevents the forest from encroaching on the grasslands, where grazing beasts flourish.
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