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Explaining osmosis: When you put an animal or plant cell into a liquid containing water one of three events will take place,

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Investigating Osmosis Throughout this experiment I will be studying the effect of osmosis on a plant cell in the form of a potato and how the concentration of a solution can vary its affect. In order to successfully carry out his experiment and analyse the results to my best potential I will need to refer back to the background knowledge I have collated on the topic. Osmosis is the passage of water from a region of high water concentration through a semi-permeable membrane to a region of low water concentration. Two examples of semi-permeable membranes: a) Visking (dialysis) tubing b) The cell membrane Since the cell membrane is semi-permeable, osmosis is important in the passage of water into and out of cells and organisms. ...read more.


The cell will stay the same size. 3. If the solution has a lower concentration of water than the cell (a very concentrated solution) the cell will lose water by osmosis. Water crosses the cell membrane in both directions, but this time more water leaves the cell than enters it. This causes the cell to shrink. Osmosis in plant cells: Plant cells always have a strong cell wall surrounding them. When they take up water by osmosis they start to swell, but the cell wall stops them from bursting. Plant cells become "turgid" (turgid means swollen and hard) when they are put in dilute solutions. The pressure inside the cell rises; eventually the pressure is so high that no more water can enter the cell. ...read more.


Although their cells are not plasmolsysed, they are not turgid and so the leaves are not held into the sunlight. Prediction: I predict that if the water concentration is higher than the concentration of water inside the potato, then the potato will become stiff, hard and enlarged, as it will take water in by osmosis. The potato should become heavier as a result of this. However, if the water concentration inside the potato is greater than outside the potato the water that was in the potato will gradually move out of the potato by osmosis. Therefore the potato will become soft, floppy and will shrink, making the potato loose weight. If the concentration is the same inside and outside of the potato then hopefully no changes should be made to the potato and its weight should stay the same. I have based my prediction according to the theory of osmosis. ...read more.

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