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

$\begin{array}{1 1}(a)\;\text{Standing crop}\\(b)\;\text{Detritus}\\(c)\;\text{Humus}\\(d)\;\text{Standing state}\end{array}$

Mass of living matter at a trophic level in an area at any time is called standing crop.
Hence (a) is the correct answer.