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Biology Coursework For this coursework I am going to be investigating the water potential of a potato. I will now go over the relevant scientific processes which are going to take place during this investigation. Firstly, Osmosis is the passage of water from a region of high water concentration through a semi-permeable membrane to a region of low water concentration. The movement of water in plant cells is controlled by this process. fig.cox.miami.edu The factor determining how much water will move from the potato is decided by the water pressure of the solution. Water potential is measured in KPA - Kilo Pascal's of pressure. Pure water has a water potential of 0. Here is a diagram of a potato cell. The starch grains found in the cytoplasm allows water potential to stay higher because starch is insoluble and want mix to make a solution. The middle of the cell contains the cell sap. http://www.uq.edu.au/_School_Science_Lessons/2.0CellPotato.GIF There are...

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