Which risk increases when a plant shifts from C3 to CAM photosynthetic pathways?

💡 Explanation

When a plant shifts to CAM, temporal separation of carbon fixation via the PEP carboxylase and the Calvin cycle with rubisco is adapted, enabling water conservation but decreasing the rate of daily carbon fixation, thus reducing overall fixation. Therefore, carbon fixation decreases, rather than other options, as CAM optimizes survival under arid condtions.

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