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: -(a) The thickened and swollen stem or root of a plant that stores food and is present underground is called a tuber. For example, the potato is a stem tuber and sweet potato is a root tuber.

Detailed explanation-3: -Geophyte. A geophyte (earth+plant) is a plant with an underground storage organ including true bulbs, corms, tubers, tuberous roots, enlarged hypocotyls, and rhizomes. Most plants with underground stems are geophytes but not all plants that are geophytes have underground stems.

Detailed explanation-4: -CC BY 2.0. A bulb is a specialized, underground organ with a short, fleshy basal stem enclosed by thick, fleshy scales modified for storage. A true bulb consists of both leaf and stem tissue.

Detailed explanation-5: -A tuber is: A short underground stem surrounded by fleshy leaves.