試題詳解

17. 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