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Unformatted text preview: In osmosis, water moves from a hypotonic solution to a hypertonic through a selectively permeable membrane. Water will diffuse across a selectively permeable membrane until the concentrations are the same on both sides (i.e. isotonic). If pressure is applied to the hypertonic side (the side into which the water is moving), it is possible to stop the inward flow of water. The amount of pressure needed to do so is called the osmotic pressure of the solution and is determined by the concentration of total solutes in the solution. Osmosis doesn't depend on the kinds of molecules or ions in solution, only on the amount of solutes. Osmosis is vitally important for plants because it enables the plant to assimilate nutrients from the soil; the soil water is hypotonic to the root cells. Osmosis also makes the cells turgid (swollen) and gives rigidity to the plant. Water in the cell (mostly in the central vacuole) exerts a gives rigidity to the plant....
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- Fall '08