Question

Each trophic level has a certain mass of living material at a particular time called as the _________.

Answer 1

Organisms at each trophic level depend on those at the lower trophic level for their energy demands. Each trophic level has a certain mass of living material at a particular time called as the standing crop. The standing crop is measured as the mass of living organisms (biomass) or the number in a unit area.

So the correct answer is 'Standing Crop'.