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Question

The dominant second trophic level in a lake ecosystem is:

A
Zooplanktons
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B
Fishes
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C
Phytoplanktons
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D
Frogs
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Solution

The correct option is A Zooplanktons

In a food chain of lake ecosystem the producers are phytoplanktons and the consumers which directly depend on phytoplanktons for food are called primary consumers. These primary consumers in a lake ecosystem are basically zooplanktons, although it may include some fishes that feed on the phytoplanktons. Therefore the dominant second trophic level in a lake ecosystem is zooplankton. Moreover zooplanktons do not occupy any other trophic levels as they only feed on the primary producers- phytoplanktons.


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