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Mass of living matter at a trophic level in an area at any time is called

 (a) standing crop

 (b) detritus

 (c) humus

 (d) standing state

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Correct option (a) standing crop

 Explanation:

 Standing crop is the total amount of living matter in a specified population at a particular time, expressed as biomass (standing biomass) or its equivalent in terms of energy. The standing crop may vary at different times of the year for example in a population of deciduous trees between summer and winter,

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