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Tom Buckland Biology Coursework SC1 Investigating the effects of osmosis on potato cylinders Centre Number 10144 Candidate Number 1913 Background Science Osmosis is the passage of water from a region of high water concentration to a region of low water concentration through a semi-permeable membrane - Oxford English Dictionary Online Figure 1 - Showing the effects of osmosis In a high concentration of water the amount of solute (e.g. salt) is low. This is called a dilute solution. In a low concentration of water the amount of solute (e.g. salt) is high. This is called a concentrated solution. When a semi-permeable membrane the water divides two such solutions will move from the region of high concentration to the region of low concentration, until both sides are equal (have reached equilibrium). Osmosis occurs across a semi-permeable membrane whenever there is a difference between the water concentrations on the two sides of the membrane when this happens, cells will either become turgid if water...

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