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CAM plants fix CO2 at night because

  • (a) their RuBisCO works only in the dark Your answer
  • (b) their light reactions occur only at night Your answer
  • (c) they lack chloroplasts in the mesophyll Your answer
  • (d) their stomata open at night, saving water Correct
Your answer: Correct answer: (d)
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Explanation

Why (d) is correct

CAM plants fix CO2 at night because their stomata open at night and stay closed in the hot day, which saves water.

Why the other options are wrong

  • (a) · your answer RuBisCO works in the day, using CO2 released from stored acids.
  • (b) · your answer Light reactions need light, so they happen in the day.
  • (c) · your answer CAM plants have chloroplasts in the mesophyll.
NCERT point: Water stress causes stomata to close, which reduces the CO2 available for photosynthesis.
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