stem generally provides support to the plant it also transfers nutrients and water from roots and food from leaves to different parts of plant in some plants stems get modified to do some mother work in this video we will learn about modification of underground stem usually stem grows above the ground but there are some stems that grow under the ground to store food stem above the ground I long but underground stem swell and become thick these stems have definite growth there are four types of underground stems one rhizome - com3 tuba for bulb rhizome is an underground takes stem with nodes and Internode's it has scale leaves at the node Jean Lee and has an irregular shape rhizome have but which give rise to new stem and leaves ginger and turmeric are examples of rhizome calm on the ground stem is round in shape and flat at the top and bottom it is a condensed form of rhizome meaning it spreads less compared to rhizome it bears one or more buds in the axles of scale leaves daughter plants arise from their buds Asia is an example of calm stem tuba is an enlarged spherical underground stem that stores food it has many dormant buds on its surface known as eyes if we plant a part of tuber with the bud it grows into a new plant potato is an example of tube bulb is a condensed stem which is disk-like and stores food in the fleshy leaves the bulb has two types of leaves one fleshy leaves two scaly leaves the upper part of the stem has a terminal bud and it is covered by many scaly leaves the inner fleshy leaves store food and onion are examples of bulb