(i) Primary productivity is the amount of biomass which is the organic matter produced by the plants in a fixed time. Primary productivity depends on various factors such as:
1) Amount of light, water, temperature and water etc.
2) It depends upon the availability of nutrients.
3) The type of ecosystem.
4) The type of environment.
ii) The relation between gross and net primary productivity is:
Net primary productivity (Pn) = Gross primary productivity (Pg) - Respiration (R)
Pn = Pg - R
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