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GPP and photosynthesis

Explain what is meant by the gross primary production of the ecosystem? How the GPP does is related to the photosynthesis?

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Gross primary production of an ecosystem, or GPP, refers to the quantity of the organic material found within the given area in the given period.

As only autotrophs generate the organic material and photosynthesis is the chief production process, GPP is the result of photosynthesis.

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