User:DIVYACBZ/Sandbox

cell wall is the outer covering (layer) of all plants. animals do not have cell wall. cell wall is made up of polysaccharides of different kinds, polymers of phenolic compounds , structural proteins, water-hydrated. functions of cell wall is :-
 * limits the dimensions of cell, because of its rigidity.
 * help in cell shape.
 * gives mechanical strength.
 * prevent entry and exit of macro molecule and movement of water.
 * ascent of sap.
 * exoskeleton of plants.
 * very difficult for pathogens to infect plants.