define cell wall??????
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The membrane that surrounds the cell and separates it from the outside environment is the cell membrane whereas a cell wall is another structural layer surrounding the cell, next to the cell membrane. The main function of the cell wall is to give the cell rigidity, strength, and protection against mechanical stress.
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Cell Wall is found in plant cells outside the plasma membrane. It is a rigid covering made up of cellulose which a complex substance is providing structural support to the plants. The contents of the cell wall contracts during loss of water in plant cells by the process of osmosis.
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