Stomatal mechanism operates in response to

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(B) The opening and closing of stomata are primarily regulated by light intensity. During the day,light triggers the accumulation of $K^+$ ions in gua

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Light

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(B) The opening and closing of stomata are primarily regulated by light intensity. During the day,light triggers the accumulation of $K^+$ ions in guard cells,which lowers the water potential,causing water to enter the cells via osmosis. This increases the turgor pressure of the guard cells,leading to the opening of the stomatal pore. Therefore,light is the most significant environmental factor influencing the stomatal mechanism.

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