how do guard cells regulate the opening and closing of stomatal ?
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The opening and closing of the stomata by the guard cells (stomatal rhythm)- In light, guard cells take up water by osmosis and become turgid. Because their inner walls are rigid they are pulled apart, opening the pore. In darkness water is lost and the inner walls move together closing the pore.Because of this, the transpiration rate is increased by an increase in light intensity
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When water from other cells enter the guard cells, they swell up and the stomata is opened and when water moves out of the guard cells, the cell shrinks and stomata closes
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