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The aim of this experiment is to find the solute potential of a potato cell by a process called osmosis.

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Introduction

Biology Coursework Osmosis Experiment Aim: The aim of this experiment is to find the solute potential of a potato cell by a process called osmosis. Background knowledge: Osmosis is a special type of diffusion in which two solutions are separated by a partially permeable membrane which allows the movement of water molecules, but not large molecules like sugar. Water diffuses from a dilute solution to a more dilute one. When water moves into the object(in this case a potato cell) through osmosis until the cell becomes turgid, it becomes swollen. When water moves out of the object(in this case a potato cell) through osmosis until the cell becomes plasmolysed , it becomes shrivelled Preliminary investigation: Method: We used the cylinder bore to cut a cylinder of potato. We then measured it and noted the size of the potato down. ...read more.

Middle

Prediction I predict that the higher the water solute potential and the lower the sugar solute potential (meaning water will move out)the cell will become smaller and plasmolysed (shrivelled). The higher the sugar solute potential and the lower the water potential (meaning the water will move in) . The cell will become larger and turgid (swollen). If the water potential and sugar potential are equal the cell will stay the same . Diagram Method: We are going to use a potato bore to cut fifteen pieces out of a potato they will be measured to the length of 20mm. we are going to place three pieces in each Petri dish. We are then going to cover each dish in one of five sugar solutions (1m,0.75M,0.5M,0.25M and 0.1M). We are then going to leave them for two hours to see what happens this is then going to be noted down in a result table. ...read more.

Conclusion

same as the potato cells ,this can be told because the potato cell didn't change size which is shown in my results table. Which shows my prediction is correct because when the molarity was too high the cell became plasmolysed and when it was too low the cell became turgid . The cells became playmolysed in the 0.1M and 0.25M sugar solutions, and the cells became turgid in the 0.75M and the 1M sugar solutions. The graph I have drawn shows a negative correlation. Evaluation: I think that the experiment went extremely well because I didn't have any anomalies and also I think that my results were accurate because they are consistent I can prove this from my results table and my graph both showing the results from the experiment (but in different ways).in my next experiment I would use more than 5 different solutions to make them even more accurate. ...read more.

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