Botany - Ecosystem Question with Solution | TestHub

The gross primary productivity (GPP) refers to the rate of energy stored by photosynthesis in plants. The R refers to the maintenance and reproduction of plants from the energy expended. GPP minus respiration losses (R) is the net primary productivity (NPP). $\mathrm{GPP} -\mathrm{R}=$ $\mathrm{NPP}$.