Carbohydrates is the collective name for starch, sugars and "fiber" polysaccharides. Carbohydrates can be classified into two categories: storage carbohydrates and structural carbohydrates. Storage carbohydrates include starch and simple sugars, such as fructose and saccharose. These carbohydrates, along with lipids in the embryonic part of seeds, are the main energy sources for the new plants that will be emerging from cereal seeds (if they were to be planted).