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Q. What is Gross primary productivity (GPP)?

NTA AbhyasNTA Abhyas 2020Ecosystem

Solution:

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