Which metabolic shift enables CAM plants to survive in arid climates despite carbon dioxide limitation?

💡 Explanation

When CAM plants face arid conditions, they temporally separate CO2 fixation because stomata open at night to uptake CO2 and store it as malic acid, then decarboxylate it during the day for photosynthesis, thus avoiding water loss by closing stomata. Temporal separation therefore results, rather than structural adaptations, enhanced pigment use, or leaf reductions which rely on different survival strategies.

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