The mass of living material in a trophic level at a particular time is called the 

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. The amount of nutrients (e.g., carbon, nitrogen, phosphorus, calcium, etc.) present in the soil at any given time, is referred to as the standing state.