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Assertion (A): Raising CO2 concentration has little effect on photosynthesis at low light intensity.
Reason (R): At low light intensity, light is the limiting factor.

  • (a) Both A and R are true, and R is the correct explanation of A. Correct
  • (b) Both A and R are true, but R is not the correct explanation of A. Your answer
  • (c) A is true but R is false. Your answer
  • (d) Both A and R are false. Your answer
Your answer: Correct answer: (a)
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Explanation

Why (a) is correct

Both are true and R explains A. At low light, light is the limiting factor, so raising CO2 has little effect.

Why the other options are wrong

  • (b) · your answer R is the reason for A.
  • (c) · your answer R is true.
  • (d) · your answer Both are true.
NCERT point: At low light neither C3 nor C4 plants respond to high CO2.
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