Which outcome results when the stomata of a C4 plant close during daylight hours in arid conditions?

💡 Explanation

When stomata close, carbon dioxide diffusion into the leaf is severely limited because the diffusion pathway is blocked, causing a reduction in CO2 concentration in mesophyll cells, which inhibits C4 fixation in mesophyll cells (which transfers to bundle sheath cells), eventually reducing carbon fixation in its entirety. Therefore photosynthetic rate decreases sharply, rather than increasing overall, because it cuts off C02 rather than respiration and the stomata are designed to prevent significant moisture change.

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