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Biology Coursework- Planning. Osmosis Osmosis is the diffusion of water molecules from an area of high concentration of sucrose solution to an area of lower concentration of sucrose solution, through a selectively permeable membrane. The water molecules move down a concentration gradient in osmosis. Two diagrams of osmosis are shown in figures 1 and 2. Figure 1 shows the diffusion of water molecules through a selectively permeable membrane from an area of highly concentrated sucrose solution to an area of lower concentrated sucrose solution. Figure 2 shows a concentration gradient, in which the water molecules are diffusing down the concentration gradient. Depending on whether the higher concentration of sucrose molecules is on the outside of the selectively permeable membrane or on the inside of the selectively permeable membrane, the cell will either become turgid or plasmolysed. If the water molecules are diffusing into the cell through the selectively permeable membrane the cell...

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