Mass of living matter at a trophic level in an area at any time is called :
Standing state
Standing crop
Detritus
Humus
The large number of organisms in an area at any given time at a trophic level is called unharvested. It represents the total biomass of the ecosystem. This is expressed in biomass. It is the total dry biomass in a given medium. So the correct answer is "Stand oes". Hence, option 2 is correct.