試題詳解

4. Which of the following statements best explains why photosynthesis using C4 or CAM systems may be described as a metabolic compromise?
(A) Both pathways increase the rate of photosynthesis but also increase the rate of water loss.
(B) The CAM pathway allows more CO2 into the plant but also increases the rate of water loss.
(C) The C4 pathway decreases water loss but also increases the rate of photorespiration.
(D) Both pathways minimize photorespiration but also expend more ATP in the process of carbon fixation.