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# Dominant second trophic level in a lake ecosystem is :-

$\begin{array}{1 1}(a)\;\text{Benthos}\\(b)\;\text{Plankton}\\(c)\;\text{Zoo plankton}\\(d)\;\text{Phytoplankton}\end{array}$

Dominant second trophic level in a lake ecosystem is benthos
Hence (a) is the correct answer.