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The correct answer for the question above is letter a. The main function of cellulose in plants is to provide physical support. Cellulose makes plants parts strong. For instance, the stems, leaves and branches are rigid because of the tough walls that surrounds the cells.
In addition to the above answers... Glycogen is the energy storage in animals, starch is the energy storage in plants, and cellulose makes up the cell wall in plants (chitin makes up cell wall in fungi and exoskeleton of arthropods). Function of polysaccharides. The main function of starch, glycogen, and cellulose is that on hydrolysis they yield Glucose that is the source of the energy. Function of cellulose, glycogen and starch. Cellulose is a polysaccharide composed of crepeating units of cellobiose (Glc beta 1,4 Glc).