The secondary productivity means

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rate of formation of the biomass by heterotrophs

rate of formation of the biomass by autotrophs

the rate at which organic molecules are used up by an autotroph

the rate at which the organic molecules are formed in an autotroph

answer is B.

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Detailed Solution

Gross primary productivity (GPP) of an ecosystem is the rate of production of organic matter during photosynthesis. A considerable amount of GPP is utilized by plants in respiration. Gross primary productivity minus respiration losses (R), is the net primary productivity (NPP). Net primary productivity is the available biomass for the consumption to heterotrophs (herbiviores and decomposers). Secondary productivity is defined as the rate of formation of new organic matter by consumers.

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