Why might the alternative pathways of photosynthesis using C4 or CAM systems be described as metabolic compromises?
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 minimise photorespiration but also expend more ATP during carbon fixation.

Question

Quizplus · Accepted Answer

Both C4 and CAM pathways minimize photorespiration by concentrating CO₂, but they require additional ATP for the extra steps involved in carbon fixation.

Why Might the Alternative Pathways of Photosynthesis Using C4 or CAM