Assertion : Net primary productivity is gross | vedclass

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(B) Net primary productivity $(NPP)$ is the rate of organic matter built up or stored by producers in their bodies per unit time and area. It is calcu

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If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

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(B) Net primary productivity $(NPP)$ is the rate of organic matter built up or stored by producers in their bodies per unit time and area. It is calculated as $NPP = GPP - R$,where $GPP$ is Gross Primary Productivity and $R$ is the energy lost due to respiration.Secondary productivity is defined as the rate of formation of new organic matter by consumers (heterotrophs) per unit time and area.Both statements are scientifically correct,but the Reason does not explain why $NPP$ is defined as $GPP$ minus respiration. Therefore,the correct option is $B$.

Assertion : Net primary productivity is gross primary productivity minus respiration.
Reason : Secondary productivity is produced by heterotrophs.

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Assertion : Net primary productivity is gross primary productivity minus respiration.Reason : Secondary productivity is produced by heterotrophs.