One tablespoon of standard sucrose, or table sugar, contains approximately 48 calories and about 12 grams of sugar.
Starch is a polymer of the monosaccharide glucose: Starch is the principal polysaccharide used by plants to store glucose for later use as energy. Plants often store starch in seeds or other specialized organs; for example, common sources of starch include rice, beans, wheat, corn, potatoes, and so on.
1 In plants they are used as energy source and for storage in the form of starch. 2  Cellulose which is a polysaccharide is an important structural component in the cell wall of plants. 3  Sucrose, a disaccharide is a product of photosynthesis and is transported internally.