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Biology sc1 Aim Find out how much water the potato cells absorb in a weekend. Planning Osmosis is the movement of water molecules across a partially permeable membrane from a region of high water concentration to a region of high water concentration to a region of low water concentration. Osmosis is a special kind of diffusion. For example, a large molecule like starch is dissolved in water. The starch molecule is too large to pass through the pores in the cell membrane, so it cannot diffuse from one side of the membrane to the other. The water molecules can, and do, pass through the membrane. So the membrane is said to be semi permeable, since it allows some molecules to pass through but not others. However, on the side of the membrane with the starch, the starch molecules interfere with the movement of the water molecules, preventing them from leaving as rapidly as they...

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