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(A) Gross Primary Productivity $(GPP)$ is defined as the total rate of production of organic matter during photosynthesis by producers in an ecosystem

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Gross primary productivity

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(A) Gross Primary Productivity $(GPP)$ is defined as the total rate of production of organic matter during photosynthesis by producers in an ecosystem.It includes the organic matter that is consumed by the plants themselves during the process of respiration.Net Primary Productivity $(NPP)$ is the remaining biomass after accounting for the loss due to respiration $(NPP = GPP - R)$.

The total rate of photosynthesis,including the organic matter used up in respiration during a definite period,is known as:

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