DENDROLOGY

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: -Example – Lilium bulbifera (lily). (b) Corm – It is the underground modification of the main stem that grows vertically at specific depth of the soil. Example – Amorphophallus. (c) Rhizome – Brown coloured underground stems that grow dorsoventrally up to a certain depth is called rhizome.

Detailed explanation-3: -Dear Student, Onion. Onion is a bulb as bulb may be defined as a modified, underground stem which are surrounded by fleshy modified leaves which helps it to store food for the growing shoot within it.