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Two plants A and B are given increasing CO2 at high light. Plant A saturates at about 360 μL L−1 while plant B keeps responding beyond 450 μL L−1. Plants A and B are most likely

  • (a) both C3 plants Your answer
  • (b) a C3 plant and a C4 plant Your answer
  • (c) a C4 plant and a C3 plant Correct
  • (d) both C4 plants Your answer
Your answer: Correct answer: (c)
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Explanation

Why (c) is correct

C4 plants saturate at about 360 μL L−1, while C3 plants keep responding beyond 450 μL L−1. So A is a C4 plant and B is a C3 plant.

Why the other options are wrong

  • (a) · your answer Plant A saturates early, which is a C4 feature.
  • (b) · your answer This reverses the two.
  • (d) · your answer Plant B keeps responding, which is a C3 feature.
NCERT point: C3 plants benefit from raised CO2.
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