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C4 plants show saturation of photosynthesis with respect to CO2 at about

  • (a) 360 μL L−1 Correct
  • (b) 450 μL L−1 Your answer
  • (c) 1000 μL L−1 Your answer
  • (d) 100 μL L−1 Your answer
Your answer: Correct answer: (a)
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Explanation

Why (a) is correct

NCERT states that C4 plants show saturation at about 360 μL L−1 of CO2, while C3 plants respond to CO2 beyond 450 μL L−1.

Why the other options are wrong

  • (b) · your answer 450 μL L−1 is the figure for C3 plants, which still respond above it.
  • (c) · your answer 1000 μL L−1 is far above C4 saturation.
  • (d) · your answer 100 μL L−1 is too low.
NCERT point: C3 plants are limited by the present CO2 level.
What is wrong?
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