CAM plants keep stomata closed in 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 the enzyme phosphofructokinase, which outcompetes rubisco for CO₂.
E) 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 to conserve water, and the organic acids are broken down to release CO₂ for photosynthesis in specialized mesophyll cells. This allows the plant to minimize water loss during the day while still carrying out photosynthesis.

CAM Plants Keep Stomata Closed in Daytime, Thus Reducing Loss