Answer :
Gross Primary Productivity is defined as the rate of production of the organic matter during the photosynthesis in an ecosystem.
Gross Primary Productivity (GPP) is utilized by the plant during respiration. The 100% GPP only 10% is left for the next trophic level. 90% of the net GPP is utilized by the plant for metabolic activities like respiration, osmoregulation, and thermoregulation. Thus, the GPP utilized by the plants minus the metabolic activities i.e., respiration losses (R) is defined as the net primary productivity (NPP).
The ecosystem tends to increase the rate of Gross Primary Productivity (GPP) for producing more food from solar energy.
Whereas, Human tends to increase the Net Primary Productivity (NPP) to ensure that food is available for the human population.
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