NPP is given by the formula -

NPP = GPP

100

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NPP = GDP - Secondary productivity

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NPP = GPP - Respiration rate

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NPP = GPP/100

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Solution

The correct option is C NPP = GPP - Respiration rate
Net primary productivity (NPP) is the amount of biomass available for the heterotrophs (including herbivores, carnivores, decomposers). It is a measure of the remaining energy or biomass (Gross primary productivity or GPP) left after meeting the cost of respiration and maintenance for the producers.
This relationship between NPP and GPP can be simplified by the following equation: NPP = GPP - R (where R = respiration and other losses).

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