Cassava and sweet potato are two completely different plants, cassava: tropical plants, evergreen shrubs, its tuberous roots contain starch, poisonous when eaten raw, add water and heat to cook will be transparent, with elasticity of taste, can be used to make starch. Sweet potato: also known as groundnut, sweet potato, etc., annual herbaceous plants, long slender vines, creeping ground, is a high-yield and adaptable food crops, tuber is an important raw material for food processing, starch and alcohol manufacturing industry, roots, stems and leaves are excellent feed.