Final answer:
Cellulose and starch are both polysaccharides and polymers of glucose, but they serve different functions in plants.
Step-by-step explanation:
Both cellulose and starch are polysaccharides and polymers of glucose. However, cellulose is found in the cell walls of plants, while starch is a storage form of energy in plants. Cellulose consists of a linear chain of glucose molecules linked through β-1,4-glycosidic bonds, providing structural support to the cell walls of plants. Starch, on the other hand, is made up of a mixture of amylose and amylopectin, which are both polymers of glucose involved in energy storage in plants.