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Solution


Q.

The mass of living material at a trophic level at a particular time is called                 [2015]
1 net primary productivity  
2 standing crop  
3 gross primary productivity  
4 standing state  

Ans.

(2)

Standing crop is the total amount of living material 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.