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The amount of biomass or organic matter produced per unit area over a time period in plants during photosynthesis is called primary production. It is expressed in terms of weight (g m-2) or energy (kcal m-2).
Gross primary productivity - is the rate of production organic matter during photosynthesis in an ecosystem.


Q69. In relation to Gross primary productivity and Net primary productivity of an ecosystem, which one of the following statements is correct?

2. Gross primary productivity is always more than net primary productivity

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