Which risk increases when guard cells lose turgor pressure, decreasing stomata aperture size?

💡 Explanation

When guard cells lose turgor pressure, stomata close, limiting CO2 uptake because the diffusion gradient reverses for CO2 and O2 favoring rubisco oxygenase activity. This leads to photorespiration. Therefore, photorespiration increases rather than transpiration, toxicity, or oxidative stress, which depend on open or otherwise dysfunctional stomata.

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