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Investigating factors that affect osmosis in plant tissues.

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Investigating factors that affect osmosis in plant tissues Introduction Definition- Osmosis is the net movement of water molecules from an area of low water potential to an area of high water potential through a semi-permeable membrane. The two containers above are of equal volume and are separated by a membrane that allows free passage of water, but totally restricts passage of solute molecules. Solution A has 3 molecules of the protein albumin therefore has a high concentration and Solution B contains 1 albumin molecule therefore has a lower concentration. ...read more.


Reverse osmosis When a semi permeable membrane separates two water volumes (or other solvent), water will flow from the side of low solute concentration, to the side of high solute concentration. The flow may be stopped, or even reversed by applying external pressure on the side of higher concentration. In such a case is known as reverse osmosis. The Consequences of Osmosis to plant cells: Plant cells always have a strong cell wall surrounding them. When the take up water by osmosis they start to swell, but the cell wall prevents them from bursting. ...read more.


Turgidity is very important to plants because this is what makes the green parts of the plant "stand up" into the sunlight. When plant cells are placed in concentrated sugar solutions they lose water by osmosis and they become "flaccid"; this is the exact opposite of "turgid". If you put plant cells into concentrated sugar solutions and look at them under a microscope you would see that the contents of the cells have shrunk and pulled away from the cell wall: they are said to be plasmolysed. When plant cells are placed in a solution, which has exactly the same osmotic strength as the cells they are in a state between turgidity and flaccidity. We call this incipient plasmolysis. ("Incipient" means, "about to be"). ...read more.

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