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What is the concentration inside a potato cell?

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Year 10 Biology Coursework What is the concentration inside a potato cell? Plan I aim to find out what concentration there is inside a potato cell. From previous experiments, I know that water molecules will travel from areas of high concentration to low concentration though partially permeable cell walls to even out the ratio between the concentration of solution outside the cell and the concentration inside the cell. E.G. This process is known as Osmosis. I can use the principle of osmosis to find out the concentration inside a potato cell. I can observe the effect on weight the solution has had on the potato after a suitable time of incubation has taken place. Equipment To do this experiment I will need to use about 5 potatoes, 10 test tubes, Differing levels of concentrated sucrose, stopwatch, and apparatus to cut the potato. Method: I will cut the potatoes into 10 equal sized pieces, and measure their weight, making sure that I note it down. All the pieces of potato will be placed in individual test tubes of sucrose, each with a different concentration. I will use 40ml of sucrose as it will completely cover the potato, and is just less than the volume of the test tube. ...read more.


Therefore I predict the graph will be linear an proportional because the net movement will be proportional, thus making the graph look like this; The point at which the Data Series crosses the x axis is 0.5M; therefore 0.5M concentration is the isotonic point. Sources To gain additional information and background knowledge for this Plan, I have used; Jones and Jones Biology, pages 8-11 Taylor and Jones Foundation Biology, pages 63-64 Obtaining Evidence and Observations Results The results that I obtained from my experiment are as follows: Concentration Of Sucrose (M) Weight Before Incubation (G) Weight After Incubation (G) % Mass Change Average % Mass Change Potato 1 Potato 2 Potato 1 Potato 2 Potato 1 Potato 2 0.1 0.58 0.65 0.62 0.66 6.9 1.54 4.22 0.2 0.59 0.62 0.61 0.62 3.34 0 1.67 0.3 0.66 0.61 0.61 0.61 -7.58 0 -3.79 0.4 0.66 0.62 0.61 0.6 -7.58 -3.25 -5.42 0.5 0.67 0.62 0.6 0.59 -10.45 -4.84 -7.65 0.6 0.62 0.66 0.55 0.59 -11.29 -10.61 -10.95 0.7 0.66 0.68 0.61 0.63 -7.45 -7.35 -7.40 0.8 0.66 0.67 0.58 0.6 -12.12 -10.45 -11.29 0.9 0.67 0.64 0.58 0.57 -13.43 -10.94 -12.19 1 0.66 0.61 0.55 0.53 -16.67 -15.87 -16.27 From looking at the table I can see only one result that looks like it may be an anomaly, but, the ...read more.


As the results are quite reliable they can be used to back up and support a firm conclusion on my experiment. How can I Improve my Experiment? There are a number of things I can do to improve the experiment or procedure. I can do more repeat tests, and start anew each time, rather than using the same solution for two pieces of potato. I can have a wider range, with smaller intervals between each reading, so that I get a bigger view of the way a cell works in different concentrations, and the level of accuracy is much higher, so I can get a more precise conclusion. When the potatoes are being dried, I could try and be more delicate, so as not to squeeze any water out from the cell. In any measuring devices, the more accurate it is, the higher level of accuracy I will achieve overall How can I extend My Work? To gain a better knowledge of the subject, I can perform similar subjects, which examine other aspects. I could try the same experiment with a different type of potato, or completely different vegetable, e.g. carrot, parsnip, etc. I could use vegetables in different solutions, e.g. a solution of salt and water, rather than sucrose and water. I can change many different factors, and find common links trends or patterns. Thomas Sherriff 10B Biology Coursework Page 1 of 9 Spring Term 2002 ...read more.

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