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Discuss the gross primary productivity i...

Discuss the gross primary productivity is more efficient than net primary productivity. 

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Gross Primary Productivity (GPP)
The total amount of food energy or organic matter or biomass produced in an ecosystem by autotrophs through the process of photosynthesis is called gross primary productivity.
Net Primary Productivity (NPP)
The proportion of energy which remains after respiration loss in the plant is called net primary productivity. It is also called as apparent photosynthesis. Thus the difference between GPP and respiration is known as NPP.
NPP = GPP - Respiration
Thus GPP is more efficient than NPP.
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