Question

list any two ways of measuring the standing crop of a trophic level.

Answer 1

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 a mass of living organisms or the number in a unit area. The biomass of a species is expressed in terms of fresh or dry weight.

Inverted pyramid of biomass is a small standing crop of phytoplanktons support a large standing crop of zooplanktons.

Answer 2

Standing crop is extensively measured in two ways:

Step by step explanation:

The two methods for measuring standing crops are as under:

1) Biomass of living organism in an unit area: This refers to the number of biological living organisms living in an unit area at a given time. It also defines species biomass, which also indicates the mass of one or more species. This mass may be expressed as the average mass per unit area or the total mass of microorganism of the community.

2) Number in a unit area: It is also expressed in the mass of living organism in an unit area (or biomass). It is also expressed in terms of fresh or dry weight respectively.