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To investigate the effect of varying concentration of a sugar solution in potato sticks of a given size.
Member rating: No Rating | Words: | Submitted: Thu Jul 11 2002
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Osmosis Aim To investigate the effect of varying concentration of a sugar solution in potato sticks of a given size. Scientific knowledge Osmosis is defined in CGP Higher Biology (by Richard Parsons) as: The movement of water molecules across a partially permeable membrane from a region of high water concentration to a region of low water concentration. The movement must take place across a partially permeable membrane such as a cell wall because it must be able to let through small particles. Molecules will keep on moving (diffuse) until the areas are equal (they have reached a state of equilibrium), so no area has a higher or lower concentration than the other. Plant cells have a strong cell wall surrounding them. The cell wall prevents the potato sticks from bursting when they take in water. The plant cells become 'turgid' (meaning swollen and hard) when put into a dilute solute solution. The pressure inside the cells become...
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