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Comparing The Water Potential Of Plants Aim The aim of this experiment is to compare the water potential of two different plant tissues, potato and sweet potato tubers, by measuring the gain or loss of water when samples of the tissue are placed in a range of concentrations of sucrose solutions. Background information Osmosis is the movement of water molecules from a region of their higher concentration to a region of their lower concentration through a semi permeably membrane. If the cell is surrounded by pure water (which has a water potential of zero), or by a solution that has a lower concentration and therefore a higher water potential, than that of the cell's contents water flows into the cell by osmosis and the cell would swell up (become turgid). The external solution is said to be hypotonic to the solution in the cell (hypo meaning lower than and applies to the solute concentration)....

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