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Question

(A) Statement $(1)$ is correct: $NPP$ (Net Primary Productivity) is indeed $GPP$ (Gross Primary Productivity) minus $R$ (Respiration losses).Statement

Vedclass · Accepted Answer

$2$

Vedclass · Answer

(A) Statement $(1)$ is correct: $NPP$ (Net Primary Productivity) is indeed $GPP$ (Gross Primary Productivity) minus $R$ (Respiration losses).Statement $(2)$ is correct: Productivity is measured in terms of biomass $(g/m^2/yr)$ or energy $(kcal/m^2/yr)$. The units provided in the question are standard scientific representations for productivity.Statement $(3)$ is incorrect: The total amount of energy produced by all producers is called Gross Primary Productivity $(GPP)$,not Net Primary Productivity $(NPP)$.Statement $(4)$ is incorrect: The total annual net primary productivity of the whole biosphere is approximately $170$ billion tons (dry weight) of organic matter. Of this,the productivity of the oceans is only $55$ billion tons,but this refers to the total biomass production,not specifically the 'net primary productivity' in the context of the entire biosphere's comparison. However,more importantly,the statement defines it as 'net primary productivity' which is often confused with total production. In the context of $NCERT$,the total annual $NPP$ of the whole biosphere is $170$ billion tons,and the oceans contribute less than half of this.Thus,only statements $(1)$ and $(2)$ are correct. The total number of correct statements is $2$.

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