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BotanyNEET 2025Structure, productivity and decomposition

Ecosystem

Given below are two statements:

Statement I: The primary source of energy in an ecosystem is solar energy.

Statement II: The rate of production of organic matter during photosynthesis in an ecosystem is called net primary productivity (NPP).

In the light of the above statements, choose the most appropriate answer from the options given below:

  1. A.Both Statement I and Statement II are correct
  2. B.Both Statement I and Statement II are incorrect
  3. C.Statement I is correct but Statement II is incorrect✓
  4. D.Statement I is incorrect but Statement II is correct

Solution

Solar energy is the primary source for almost every ecosystem (I correct). The rate of organic-matter production during photosynthesis is the gross primary productivity; NPP is what remains after respiratory loss, so II is incorrect.

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