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Investigating the concentration of cell sap in potatoes Plan Osmosis is the movement of liquid through a semi permeable surface. The liquid passes from the dilute solution to the concentrated solution until both solutions are equal. This is needed for plants for them to get water from their roots to their stem and leaves. The cell wall of a plant cell is semi permeable. The sap inside a cell is slightly sugary. Only water molecules can pass through the membrane of the cell because they are small enough. Sugar molecules are too large to go through so they stay where they are, no matter how concentrated the solution may be. When placed in distilled water, osmosis will try and even out the concentration by absorbing in from the distilled water. This diagram explains what happens in this situation: Osmosis also works the other way round. When the cell is placed in a high...

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