How does the absorption and loss of potassium ions on the guard cells bring about the opening and closing of stomata?
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When the guard cells take in potassium ions, water diffuses into the cells by osmosis. Osmosis is the movement of water from an area of low concentration of solute (dissolved substance) to an area of high concentration of solute. ... This causes the guard cells to bend away from each other, thereby opening the stomata.
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