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B
Desert ecosystem
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C
Grass ecosystem
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D
Forest ecosystem
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Solution
The correct option is A Pond ecosystem An ecosystem consists of living and nonliving components. In pond ecosystem, phytoplankton are primary producers which prepare their own food. These are eaten by zooplankton which is further eaten by small fish which is then eaten by large fish. Hence, phytoplankton is a component of pond ecosystem present at the first trophic level.