Give the five modification types of arial stem with examples
Answers
Answer:
1. Rhizome:
It is fleshy, non-green underground stem. It has distinct nodes and internodes. The nodes bear dry scale leaves with axillary buds. Terminal buds also present. Adventitious roots arise from the lower side. The rhizome that grow obliquely is called root stock rhizome (e..g., Alocasia, Dryopteris, Banana etc.) and when grow horizontally is called straggling rhizome [e.g. Ginger, termeric, Cannaetc.).
2. Bulb:
It is a highly condensed discoid stem its upper surface a terminal bud and many fleshy scale leaves are present. A cluster of adventitious roots arise from the base of the bulb. The bulbs may be tunicated or scaly. A tunicated bulb is covered by a sheath of dry membranous scale leaves called tunic, e.g., onion and garlic. In case of garlic, the bulb consists of an aggregate of bulblets or cloves, each covered by its individual tunic. A scaly bulb is without any tunic, e.g., Lily.
3. Corm:
It is a condensed form of rhizome growing in vertical direction. It is more or less spherical with a flattered base. The corm has distinct circular nodes and in ternodes. The n ides bear scale leaves and axillary buds. Adventitious roots arise either from its base or all over the body. Examples- colocasia, corcus, Amorphophallus.
4. Tuber:
Stem tuber is a swollen tip of an underground lateral Stem (Stolon). It is covered by a corry Skin with a number small depressions called eyes’. Each eye represents a node, bearing one or more buds subtended by a leaf scar (= scale leaf). A big scar at one end (heel end) of a potato marks its attachment to the stolon. Adventitious roots are usually absent e.g., Potato.
hope it helps u☺️
mark as brainliest also