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Q.

Mark the incorrect combination.

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a

Trophic level - organisms of ecosystem are arranged into different feeding groups

b

 Food web - defines the importance of animal relationships and food sources

c

Standing crop - mass of living material that is expressed only in fresh weight

d

Standing state - amount of macro nutrients in the soil at any given time

answer is C.

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Detailed Solution

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 biomass of a species is expressed in terms of fresh or dry weight. Measurement of biomass in terms of dry weight is more accurate.

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