. Net primary productivity can be stated as

(a)           GPP + R = NPP.   

(b)          GPP + NPP = R    

(c)           GPP – NPP = R.   

(d)          GPP – R = NPP.

Best Answer

(d)       GPP – R = NPP.

Here NPP or net primary productivity is the biomass available for consumption by herbivores after respiratory loss. This makes up the scaffold for support of energy in an ecosystem. GPP or gross primary productivity on the other hand, is the total biomass produced initially, if only photosynthesis is considered. This is the basic biomass produced by primary producers.


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