In a grassland ecosystem,which productivity ( | vedclass

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(D) In any ecosystem,the total amount of organic matter produced by producers through photosynthesis is known as Gross Primary Productivity $(GPP)$.Ne

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Gross primary productivity

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(D) In any ecosystem,the total amount of organic matter produced by producers through photosynthesis is known as Gross Primary Productivity $(GPP)$.Net Primary Productivity $(NPP)$ is the amount of biomass available to consumers after accounting for the energy lost by producers during respiration $(R)$.The relationship is defined as: $NPP = GPP - R$.Since $GPP$ represents the total energy captured before any losses,it is always higher than $NPP$ or any other form of productivity in an ecosystem.

Column-$I$	Column-$II$
$(a)$ $\text{NPP}$ of ocean	$(i)$ $115$ billion tons
$(b)$ Annual $\text{NPP}$ of the whole biosphere	$(ii)$ $170$ billion tons
$(c)$ $\text{NPP}$ of terrestrial ecosystem	$(iii)$ $55$ billion tons
$(d)$ Secondary productivity	$(iv)$ Heterotrophs

In a grassland ecosystem,which productivity $(g/m^2/yr)$ is the highest?

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