CAM Plants Keep Stomata Closed in the Daytime, Thus Reducing

question 56

Multiple Choice

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 the enzyme phosphofructokinase, which outcompetes rubisco for CO2
• E) use photosystem I and photosystem II at night

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