If a plant cell is placed in pure water or solution of higher water potential than the solution in its vacuole, the water moves from outside the cell (endosmosis) and ultimately into the vacuole. As a result, the cell swells or becomes turgid such as external solution is called hypotonic . Further allowing the cell into such hypotonic medium does not cause art internal hydrostatic pressure or pressure potential due to which further up take of water in cytoplasm is resisted and finally stops.
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