Which outcome occurs when high humidity increases boundary layer thickness in C4 plants?

💡 Explanation

When humidity increases, the boundary layer thickens, reducing the CO2 concentration gradient which decreases the driving force for CO2 diffusion through stomata to mesophyll cells performing initial CO2 fixation in C4 plants. Therefore reduced CO2 diffusion results, rather than increased photorespiration,enhanced water uptake or decreased nitrogen fixation, which are triggered by different environmental stressors factors.

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