When 2 regions or solutions with different levels of concentration are seperated by a differentially or selectively permeable membrane(i.e it allows solvent i.e liquid molecules pass through), then conditions for Osmosis are obvious. Osmosis is the movement of solvent(fluid) molecules from the region of weaker concentration to the region of stronger concentration through a selectively permeable membrane. This membrane could be plant cell or animal cell. Usually and naturally, osmosis takes place only in living cells. The region of srtonger solution is called HYPERTONIC SOLUTION, the region of weaker solution is said to be HYPOTONIC SOLUTION. But when the region of the living cell and its sorrounding are of the same level of concentration, the solution is said to be ISOTONIC solution. The hypertonic solution exerts pressure on the cytoplasm of the cell, as a result, extracts the weaker solution to itself. This pressure exacts by the hypertonic solution is called the OSMOTIC PRESSURE. OSMOREGULATION is the control of fluctuation of materials in and out of the cell. The outward movement of H2O molecules from a living plant cell is called PLASMOLYSIS. This conditions occurs when a plant cell is placed in hypertonic solution, the solution withdraws the cell water to itself. As a result the plant becomes shrink and die. So we say the plant has plasmolysed. Another condition which occurs as a result of Osmosis is HEAMOLYSIS. This occurs in the red corpuscles when it is placed in hypotonic solution. The red corpuscle absorbs water from its sorrounding and the cell becomes fully streched and split or burst. TURGIDITY is when the plant cell is placed in hypotonic solution, absorbs water from its sorrounding and becom
Posted on: Thu, 26 Sep 2013 15:26:59 +0000
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