Multiple choice

In CAM plants, the stomata opens during night to

  1. retain water

  2. avoid photoinhibition

  3. recycle their internal CO2 efficiently

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

CAM plants open stomata at night to fix CO2 into malic acid, which simultaneously reduces water loss through transpiration, prevents photoinhibition by avoiding excess light absorption during the day, and allows efficient recycling of internally released CO2 during daylight hours. This nocturnal stomatal opening strategy is a key adaptation to arid conditions.

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