AP BIOLOGY

Detailed explanation-1: -Rhizomes are underground stems which grow beneath the surface of soil; they are frequently fleshy and serve as organs of food storage. Sometimes the rhizomes are condensed into solid swollen forms which are then known as corms. The tubers are also underground parts, which may either be modified roots or stems.

Detailed explanation-2: -Examples of underground stems include corms, such as taro (left); rhizomes, such as ginger (center); and tubers, such as potatoes (right).

Detailed explanation-3: -Underground stems are modified plant parts that derive from stem tissue but exist under the soil surface. They function as storage tissues for food and nutrients, in propagation of new clones, and in perennation (survival from one growing season to the next). Types include bulbs, corms, rhizomes, stolons, and tubers.

Detailed explanation-4: -tuber, specialized storage stem of certain seed plants. Tubers are usually short and thickened and typically grow below the soil. Largely composed of starch-storing parenchyma tissue, they constitute the resting stage of various plants and enable overwintering in many species.

Detailed explanation-5: -The tuber is modified for the storage of food. Potato grows on the underground stem. This stem is known as stolon.