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BIOLOGY INVESTIGATION-OSMOSIS IN A PLANT CELL AIM To investigate the effect on osmosis in a plant cell consequent to a change in the concentration of its surroundings. BACKGROUND INFORMATION OSMOSIS Osmosis is diffusion but it is specialised diffusion that can only involve the movement of water molecules across a semi-permeable membrane. It is defined as "the passage of water from a region where it has a higher water potential to a region where it has a lower water potential through a partially permeable membrane. Water potential is measured in units of pressure (usually kiloPascals). It is the pressure created by water and, under room temperature and standard pressure (25c and 100kPa), pure water has a potential of zero. Therefore, changes in certain conditions would mean the water potential would change. Some key points to take into account are: * The addition of a solute (e.g. salt) to a solvent (e.g. water) will lower the water...

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