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Investigating Osmosis Introduction Definitions - Osmosis is the movement of water molecules from where they are at a high concentration to where they are at a lower concentration through a selectively permeable membrane. A selectively permeable membrane is one which allows only molecules of a certain size through. This very basic diagram shows osmosis occurring between sugar solutions and water in visking tubing and beakers. The bag expands because the water moves from the beaker where it is at a higher concentration through into the tubing where it is at a lower concentration. Example of osmosis - Osmosis is the way in which plants absorb water (and get their minerals).The cell walls in the root hairs are semi-permeable. In the soil, the water is fairly pure and has no dissolved sugar in it so there are lots of water molecules and no big sugar molecules blocking their way. Many water molecules hit the cell...

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