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Osmosis in Potato cells
Member rating: No Rating | Words: | Submitted: Mon Dec 11 2006
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ACCESS HUMAN BIOLOGY UNIT A Practical Assignment - Osmosis in potato cells Planning The aim of this experiment is to investigate the movement of water in and out of plant cells. The plant cells that we will use are potato cells. Osmosis is defined as the passage of water from a region of high concentration of water, to a region of low concentration of water through a semi permeable membrane. A semi permeable membrane is defined as a thin layer of material that allows some materials to pass through (such as water or some proteins) and prevents other materials from passing through (such as sugar or salt). The diagram below demonstrates osmosis taking place through a semi permeable membrane. Diagram taken from http://fig.cox.miami.edu/~lfarmer/BIL265/BIL2001/osmosis.JPG Plant cells are constructed with a thick cell wall and a central cavity filled with fluid, this can occupy over 80% of the volume of the cell. When osmosis takes place and water passes through...
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