The Alternative Pathways of Photosynthesis Using the C₄ or CAM

question 65

Multiple Choice

The alternative pathways of photosynthesis using the C₄ or CAM systems are said to be compromises. Why?

• A) Each one minimizes both water loss and rate of photosynthesis.
• B) C₄ compromises on water loss and CAM compromises on photorespiration.
• C) Both minimize photorespiration but expend more ATP during carbon fixation.
• D) CAM plants allow more water loss, while C₄ plants allow less CO₂ into the plant.
• E) C₄ plants allow less water loss but CAM plants allow more water loss.

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