(1) Rhizome : It is horizontal underground plant stem capable of producing the shoot and root systems of a new plant, rhizome is the banana plant’s true stem; Bulb: a short stem with fleshy leaves or leaf bases, found in onion; Tuber: It is the thickened part of an underground stem of a plant, such as the potato, with buds from which new plant shoots (stems and young leaves of a new plant) grow.