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Investigating osmosis on swede cells. Aim: To investigate the effect of sucrose solution on swede cells in order to determine the water potential of them. Background information: 'Osmosis is the diffusion of water only. It is the net movement of solvent (water) molecules from a region of high concentration to a region of their lower concentration, through a partially permeable membrane.' 1 Robert. M, Reiss. M, Monger. G, Biology Principles, Nelson, 1993 A diagram summarising the conditions on the two sides of a partially permeable membrane, and the terms used to describe them. The large black blobs represent sucrose molecules, the smaller white circles represent water molecules. The terms 'high' and 'low' relate. In the diagram above the solute molecules are too large to diffuse through the partially permeable membrane but as water molecules are a lot smaller they can diffuse down the concentration gradient to where there is a lower concentration of water molecules. Although...

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