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explan the macanism of opening and closing of stomata?

Guard cells regulate the opening and closing of the stomata and this regulation is brought about by the movement of water in and out of the guard cells. Potassium ions play a role in the opening and closing of stomata by changing the concentration of ions in the guard cells. When the potassium ions are inside the guard cells, water also flows into the guard cells because of osmosis causes them to swell which results in the opening of stomata. When the potassium ions are out of the guard cells, water also flows out of the guard cells because of osmosis and the stomata close. 

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The opening and closing of stomatal opening is regulated by the guard cells. When water enters the guard cells from the subsidiary cells by osmosis, then the guard cells swell, and the stoma opens. When the water moves out of the guard cells, then it shriks and the pore closes.

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 Guard cells regulate the opening and closing of the stomata and this regulation is brought about by the movement of water in and out of the guard cells. When water moves into the guard cells, they become flaccid. This causes the outer walls of cells bulge out and vice-versa.

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