■ PYRAMID OF BIOMASS
◇ Pyramid of biomass is usually determined by collecting all organisms occupying each trophic level separately and measuring their dry weight.
◇ This overcomes the size difference problem because all kinds of organisms at a trophic level are weighed.
◇ Each trophic level has a certain mass of living material at a particular time called the standing crop.
◇ The standing crop is measured as the mass of living organisms (biomass) or the number in a unit area.
