|Class 9 Biology Fundamental Unit of Life||Cell wall|
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.
Due to the presence of cell wall plant cells can withstand greater changes in the surrounding media due to the exertion of equal pressure to the cell when it swells up by taking up water through osmosis in a hypnotic media.