Statement I : Net primary productivity is less than the gross primary productivity.\ Statement II:

Question

Statement I : Net primary productivity is less than the gross primary productivity.\ Statement II: Net primary productivity is equal to the gross primary productivity minus respiration losses.\

Professor PC Thomas Classes · Answer

(a) : Gross primary productivity (GPP) of an ecosystem is the rate of production of organic matter during photosynthesis. Net primary productivity (NPP) is the amount of organic matter stored by producers after respiration per unit area per unit time. Gross primary productivity minus respiration losses is the net primary productivity, i.e., $\mathrm{NPP}=\mathrm{GPP}-\mathrm{R}$.