The organisms dwelling at the bottom of a lake are called
Phytoplanktons
Zooplanktons
Nektons
Benthos
In the stratification of an aquatic ecosystem like a lake or large pond the organisms at the bottom or benthic zone are called benthos.
The second trophic level in a lake is: (a) phytoplankton (b) zooplankton (c) benthos (d) fishes