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An Investigation into the water potential of a white potato
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Biology Coursework An Investigation into the water potential of a white potato Ben Smith, 10S Aim: To discover the water potential of a white potato, by investigating the extent to which osmosis occurs in sucrose solutions of differing concentrations. Prediction: Osmosis is defined as "the spontaneous passage or diffusion of water or other solvents through a semi permeable membrane" (such as a cell membrane). The presence of a cell membrane is important because it allows only particles small enough to pass though it to escape, placing a limit on the extent to which osmosis occurs. During my research into "stem tubers" (the part of the potato plant we eat), I found that the energy contained in them was converted into starch for storage. Starch is an insoluble material, with a fairly large size and therefore cannot pass through the membrane, and also cannot dissolve and then pass through the membrane. These characteristics of starch as...
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