Botany - Ecosystem Question with Solution | TestHub

Primary productivity is of two types:

A. Gross primary productivity (GPP): It is the rate of production of organic matter during photosynthesis.

B. Net primary productivity (NPP): It is the biomass available for the consumption of heterotrophs (herbivores and decomposers).

A part of GPP is utilized by plants in respiration (R), whereas the remaining is available for the next trophic level. Hence, NPP = GPP - R