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Investigating the water potential of potato cells.

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Introduction

Investigating the water potential of potato cells Introduction I am going to be doing an experiment to try and measure the water potential of potato cells. The net direction of water movement in a cell depends on whether the water potential of the cell solution is more negative or less negative than the water potential of the external solution. Aim To measure the water potential of potato cells in different concentrations of sucrose solution. Equipment Reasons for choosing equipment 1. 18 test tubes are used to place in the different concentrations of solution with the potato 2. Pipette is used to measure out solutions 3. Potato is used for finding out the potential in its cells 4. ...read more.

Middle

. 2. Using labels, label all of your test tubes and beakers. 3. Using the cork borer, cut up the potato, for safety put a tile under the potato, so you do not cut your hand as the cork borer goes through the potato. 4. Weigh and note the length of 7 potato samples, place in 7 of the labelled test tubes. 5. Repeat the previous steps, from 3 onwards, do this two more times so that you can make sure that the accurate results are acquired. 6. Leave the test tubes in the test tube rack for 24 hours. 7. When the time is up you can check the position of the potato in the test tubes. ...read more.

Conclusion

Handling the potato may have also caused a affect on the water potential results. Human error is also a large problem that could have occurred. If I had a chance to do my experiment again I would use accurate measuring tools and cutting tools. To stop any evaporation that may occur I would not only cover the test tubes I would cover them in black paper so they couldn't not evaporate. For drying the potato the best thing I could do is cover them in a tissue and let them dry naturally, this would take more time but I think that the results would be more accurate, I would also use gloves to handle all of my potato samples this way I would not disturb the water potential results. Raj Brahmbhatt a/s level coursework biology ...read more.

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