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Biology Coursework Aim: Investigating osmosis inside a potato with different concentrations solutions. A little about Osmosis: Osmosis is the passage of water from a region of high water concentration through a semi-permeable membrane to a region of low concentration. Semi-permeable membranes are very thin layers of material (cell membranes are semi-permeable), which allow some things to pass through them but prevent other things from passing through. Cell membranes will allow small molecules like oxygen, water, and carbon dioxide to pass through. Cell membranes will not allow larger molecules like Sucrose to pass through If the medium surrounding the cell has a higher water concentration than the cell, the cell will gain water by osmosis. Water molecules are free to pass across the cell membrane in both directions, but more water will enter than leave the cell. The overall result is that water enters the cell and the cell swells up. If the medium has a lower concentration of...

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