CAM plants keep stomata closed in the daytime, thus reducing loss of water. They can do this because they ________.
A) fix CO₂ into organic acids during the night
B) fix CO₂ into sugars in the bundle-sheath cells
C) fix CO₂ into pyruvate in the mesophyll cells
D) use photosystem I and photosystem II at night

Question

Quizplus · Accepted Answer

CAM plants fix CO₂ into organic acids during the night and store them in vacuoles. During the day, the stomata remain closed, and the organic acids are broken down to release CO₂ for use in the Calvin cycle. This allows the plant to reduce water loss during the day, while still being able to perform photosynthesis.

CAM Plants Keep Stomata Closed in the Daytime, Thus Reducing