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An Experiment to determine Water Potential in Potato Tissue Introduction Osmosis is the movement of water molecules move from a region of high water concentration (high water potential) to a region of low water concentration (low water potential). The water molecules also move through a partially permeable membrane. Osmosis affects the shape of plant cells. When a plant cell is in a lower water potential (highly concentrated solution), water from the plant cell moves out and therefore it becomes flaccid, and this is when the cell membrane of the plant cell shrinks. When a plant cell is in a solution which has higher water potential, the water moves into the cell and therefore it becomes turgid, this is when the cell membrane expands. In both cases, it is only the cell membrane that changes its shape. The cell wall always keeps its shape. The mass of plant cells change as well....

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