The second trophic level in a lake is

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$(c)$ Zooplankton Zooplankton are primary consumers in aquatic food chains that feed upon phytoplankton. Therefore, they are present at the second trophic level in a lake.

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They are tertiary and secondary consumers respectively

In a pond ecosystem, benthos means

Definitions / Explanation :

$(i)$ Saprotrophs

$(ii)$ Trophic level

Flow of energy through various trophic levels in an ecosystem is unidirectional and non-cyclic. Explain.

Distinguish between 

$(a)$ Litter and detritus

$(b)$ Primary and secondary productivity