Stomatal movement is not affected by

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(B) Stomatal movement is primarily regulated by environmental factors such as light,temperature,and the concentration of $CO_2$ inside the leaf.Light

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$O_2$ concentration

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(B) Stomatal movement is primarily regulated by environmental factors such as light,temperature,and the concentration of $CO_2$ inside the leaf.Light triggers the opening of stomata by promoting the accumulation of potassium ions $(K^+)$ in guard cells,which lowers the water potential and causes water to enter the cells via osmosis.$CO_2$ concentration acts as a feedback mechanism; high internal $CO_2$ levels typically induce stomatal closure to prevent excessive water loss while maintaining gas exchange efficiency.Temperature influences the rate of transpiration and the metabolic activity of guard cells.However,the concentration of $O_2$ does not have a direct regulatory effect on the opening or closing of stomata.

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