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The present CO2 level of the atmosphere is limiting for

  • (a) neither C3 nor C4 plants Your answer
  • (b) CAM plants only Your answer
  • (c) C3 plants Correct
  • (d) C4 plants only Your answer
Your answer: Correct answer: (c)
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Explanation

Why (c) is correct

The present CO2 level is limiting for C3 plants, which respond to higher CO2 with more photosynthesis.

Why the other options are wrong

  • (a) · your answer It is limiting for C3 plants.
  • (b) · your answer CAM plants are not the group singled out in NCERT.
  • (d) · your answer C4 plants are saturated at about 360 μL L−1.
NCERT point: This is why C3 greenhouse crops benefit from CO2 enrichment.
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