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At high light intensity, the rate of photosynthesis does not increase further with light because

  • (a) CO2 is released Your answer
  • (b) chlorophyll stops absorbing light Your answer
  • (c) light becomes harmful at once Your answer
  • (d) other factors become limiting Correct
Your answer: Correct answer: (d)
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Explanation

Why (d) is correct

At high light, the rate stops increasing because other factors (such as CO2) become limiting.

Why the other options are wrong

  • (a) · your answer CO2 is not released because of high light.
  • (b) · your answer Chlorophyll still absorbs light at high intensity.
  • (c) · your answer Light becomes harmful only at very high intensity, not at once.
NCERT point: This is an example of Blackman's law.
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