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Question

Which of the following may occupy any trophic level in an ecosystem?

A
Plankton
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B
Aquatic animals
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C
Decomposers
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D
Aquatic plants
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Solution

The correct option is A Aquatic animals
There are various trophic levels in a food chain. The first trophic level consists of primary producers such as plant. The second trophic level consists of herbivores or primary consumers. The third trophic level consists of carnivores or secondary consumers. Decomposers are present at the top trophic level. Phytoplankton occupies the first trophic level in an ecosystem. The zooplankton feeding upon phytoplankton occupies the second trophic level in an ecosystem. Aquatic animals occupy any trophic level in an ecosystem. Aquatic animals such as zooplankton occupies first trophic level. Aquatic animals such as small fish occupies second trophic level. Aquatic animals such as large fish occupies third trophic level. The aquatic plants occupy first trophic level.
Thus, the correct answer is 'Aquatic animals.'

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