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A considerable amount of organic matter produced during photosynthesis is utilized by plants for their own respiration. Which of the following correctly represents this utilized amount?

Options

  1. AGPP - NPP
  2. BGPP + NPP
  3. CNPP - GPP
  4. DSecondary productivity

Correct answer

A. GPP - NPP

Step-by-step solution

Gross primary productivity (GPP) is the total rate of photosynthesis, but plants use some of this organic matter for their own respiration (R). The remaining biomass is the net primary productivity (NPP). This relationship is given by the equation: GPP - R = NPP Rearranging this equation to solve for the respiratory loss (R) gives: R = GPP - NPP Secondary productivity refers to the formation of new organic matter by consumers, not the respiratory loss of plants. Answer: GPP - NPP

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