Photosynthesis · Botany

CAM (Crassulacean Acid Metabolism) plants reduce photorespiration by:

  1. Fixing carbon only during the day
  2. Fixing carbon into 4-carbon compounds in different cells
  3. Opening their stomata at night to fix CO2 into organic acids
  4. Eliminating the Calvin Cycle entirely
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Correct answer: Opening their stomata at night to fix CO2 into organic acids

CAM plants, typically found in arid environments, open stomata at night to minimize water loss. They store CO2 as organic acids overnight and then release it for the Calvin Cycle during the day when the stomata are closed.

Difficulty: Medium Question 8 of 20

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