Aleurone grains are rich in proteins. Aleurone layer is the peripheral part of endosperm and is very important physiologically because it secretes or accumulates the hydrolyzing enzyme which help in digestion of reserve food material during digestion. Cereal grain (wheat, rice, maize) are rich source of carbohydrates. Auxin, is a plant hormone. It causes, apical dominance, root initiation, parthenocarpy etc. Fat is stored in the seed of mustard, cotton etc.