Starch is one of the most important polysaccharides. It is a type of carbohydrate that is insoluble in water. Starch is used by plants to store excess glucose. Starch is used as an additive and as a thickening agent. It can be found in the fruit, seeds, and rhizome of plants. It is also present in rice, wheat, corn, potatoes, beans, yam, sweet potato, banana, and much more.