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CAM helps plants in

  • (a) secondary growth Your answer
  • (b) disease resistance Your answer
  • (c) reproduction Your answer
  • (d) conserving water Correct
Your answer: Correct answer: (d)
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Explanation

Why (d) is correct

In CAM plants (such as many succulents), stomata open at night and stay closed during the hot day. CO2 is fixed at night, so less water is lost: CAM helps the plant conserve water.

Why the other options are wrong

  • (a) · your answer CAM is a photosynthetic adaptation; it has nothing to do with secondary growth.
  • (b) · your answer CAM is not a defence against disease.
  • (c) · your answer CAM concerns carbon fixation, not reproduction.
NCERT point: C4 plants are adapted to dry tropical regions and have better water-use efficiency than C3 plants.
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