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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Net primary productivity of an ecosystem is always more than its gross primary productivity. Reason (R): A considerable amount of gross primary productivity is utilized by plants in respiration. In the light of the above statements, choose the most appropriate answer from the options given below:

Options

  1. ABoth (A) and (R) are correct and (R) is the correct explanation of (A)
  2. BBoth (A) and (R) are correct but (R) is not the correct explanation of (A)
  3. C(A) is correct but (R) is not correct
  4. D(A) is not correct but (R) is correct

Correct answer

D. (A) is not correct but (R) is correct

Step-by-step solution

Gross primary productivity (GPP) is the rate of production of organic matter during photosynthesis. A considerable amount of GPP is utilized by plants in respiration (R). Net primary productivity (NPP) is the gross primary productivity minus respiration losses (NPP = GPP - R). Because respiration loss (R) is a positive value, GPP is always greater than NPP. Therefore, the Assertion (A) is incorrect. The Reason (R) is a correct statement as plants do utilize a significant portion of GPP for their own respiration. An

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