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Which of the following is the best explanation for C4 plants being better suited to hot, dry conditions than C3 plants?

  • (a) They lack the Calvin cycle and so need much less water and CO2. Your answer
  • (b) They fix CO2 well even with partly closed stomata, without photorespiration. Correct
  • (c) They do not open their stomata at all during the day or night. Your answer
  • (d) They store large amounts of water in their bundle sheath cells. Your answer
Your answer: Correct answer: (b)
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Explanation

Why (b) is correct

C4 plants can fix CO2 efficiently even when stomata are partly closed (to save water), because PEPcase works at low CO2 and there is no photorespiration.

Why the other options are wrong

  • (a) · your answer C4 plants do have the Calvin cycle.
  • (c) · your answer C4 plants open their stomata during the day.
  • (d) · your answer Bundle sheath cells are not water-storage cells.
NCERT point: C4 plants have better water-use efficiency.
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Practise Photosynthesis in Higher Plants
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