In an ecosystem, keystone species are:

Species that are predatory in nature

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Species that exert main influence out of proportion to its abundance

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Species that decrease the flow of energy through ecosystems

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Species at the top tropic level of an ecosystem

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Solution

The correct option is B Species that exert main influence out of proportion to its abundance
Keystone species are those which have an extremely high impact on a particular ecosystem relative to its population. Keystone species are also critical for the overall structure and function of an ecosystem. They influence other types of plants and animals in that ecosystem.

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