The functions of polysaccharides are
(i) Starch and glycogen are the major storage food of organic world.
(ii) On hydrolysis, storage carbohydrates provide both energy and carbon chains.
(iii) Chitin is the structural carbohydrate of fungal walls and exoskeleton of arthropods.
(iv) Cellulose is the structural substance of cell walls in most of the plants.
(v) Cellulose is economically important in the production of furniture, shelter, fuel, paper,textiles, ropes, rayon, cellophane, plastics, etc.