Why Might the Alternative Pathways of Photosynthesis Using C₄ or CAM

question 28

Multiple Choice

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 minimize photorespiration but also expend more ATP during carbon fixation.

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