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Which of the following does NOT increase the rate of photosynthesis of a C3 crop under bright light?

  • (a) keeping temperature near its optimum Your answer
  • (b) giving enough water to keep stomata open Your answer
  • (c) raising light intensity far beyond saturation Correct
  • (d) raising CO2 from 0.03% to 0.05% Your answer
Your answer: Correct answer: (c)
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Explanation

Why (c) is correct

Raising light far beyond saturation does not increase photosynthesis; very high light can even damage chlorophyll. The other changes help a C3 crop.

Why the other options are wrong

  • (a) · your answer Optimal temperature helps the enzymes work fastest.
  • (b) · your answer Open stomata let CO2 in.
  • (d) · your answer Raising CO2 to 0.05% increases fixation in C3 plants.
NCERT point: Beyond light saturation, other factors limit the rate.
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