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Science coursework Osmosis Investigation Background Osmosis Osmosis is the diffusion of water only, the movement of water particles from an area of a high water concentration to an area if lower water concentration through a partially permeable membrane. Cell membranes are partially permeable because they allow water to pass through, but not others. When the diffusion gradient of water has disappeared, osmosis stops. Osmosis in plant cells Cell, in nature fluctuate between being flaccid and fully turgid. Osmosis is very important for the plants. * Helping to support a plant The vacuole of a plant cell contains cell sap, which is a solution of different solutes in water. Water therefore enters the cell sap by osmosis, and the vacuole has the appearance of blown up a balloon. This forces the cytoplasm against the cell wall. The cell is said to be 'Turgid'. If a plant is short of water, for example a pot plant which has not watered...

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