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    Question

    Which of the following represents net primary

    productivity?
    A Total biomass accumulated over time Correct Answer Incorrect Answer
    B Energy lost in respiration Correct Answer Incorrect Answer
    C Energy available for herbivores Correct Answer Incorrect Answer
    D Total energy fixed by autotrophs Correct Answer Incorrect Answer

    Solution

    Net Primary Productivity (NPP) is the energy or biomass that remains after autotrophs (producers) have used some of it for respiration (R). It represents the energy available for the next trophic level, i.e., herbivores (primary consumers). It is calculated as: NPP=GPP−R where GPP (Gross Primary Productivity) is the total energy fixed by autotrophs through photosynthesis, and R is the energy used in respiration.

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