Which process limits CO2 absorption in C4 plants after prolonged drought stress?

💡 Explanation

Under drought stress, stomatal closure minimizes water loss, which inevitably decreases intercellular CO2 concentration because diffusion gradient is reduced, thereby limiting CO2 availibilty for carboxylation in mesophyll cells. Therefore limited intercellular CO2 reduces absorption, rather than increased resistance, rubisco inactivation or sheath depletion which affect internal photosynthetic process directly.

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