The modified stems which grow below the soil are called underground stems.
The various types of underground stems are as follows :-
(i) Rhizome :- Rhizomes are underground modified stems which grow horizontally under the soil and act as storage organs. Example – Ginger
(ii) Bulb :- Bulb is an underground modified stem whose roots grow down and short fleshy leaves emerge at the top. Example – Onion
(iii) Tubers :- Tubers are thick, fleshy and short modified underground stems which act as storage. Example – Potato
(iv) Sucker :- They are modified underground stems which develop from the main stem and in the beginning they grow horizontally and later on upward obliquely. Example – Corn mint
(v) Corm :- Corm is a modified underground stem which is thick and rounded and may bear some buds. Example – Colocasia
Final answer :-
Hence, this is the definition of underground stem and explanation of its various types with one example.
