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The rate of photosynthesis is higher in

  • (a) continuous light Your answer
  • (b) green light Your answer
  • (c) very high light Your answer
  • (d) red light Correct
Your answer: Correct answer: (d)
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Explanation

Why (d) is correct

Chlorophyll absorbs red light strongly, and the action spectrum of photosynthesis has a high peak in the red region, so the rate is high in red light.

Why the other options are wrong

  • (a) · your answer Continuous light does not by itself raise the rate; light quality and intensity matter.
  • (b) · your answer Green light is mostly reflected, so photosynthesis is lowest in green light.
  • (c) · your answer Very high light gives no extra gain beyond saturation and can damage chlorophyll.
NCERT point: Photosynthesis is highest in the blue and red regions of the spectrum.
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