Rhizome or corm
Onion is a modified stem because it is a stem which grows underground
corm
Yes
No, a radish is not considered an underground stem. It is considered a type of root just like carrots and sweet potatoes.
Onion is an underground stem called a bulb. It grows horizontally below the surface of the soil, from which roots grow downward and shoots emerge above ground.
potato
modified underground stem
No, a radish is not considered an underground stem. It is considered a type of root just like carrots and sweet potatoes.
The modified stems which are found in underground is called as stem tubers
A modified underground stem is a plant structure that grows beneath the surface of the soil and has been adapted to serve specific functions, such as storing nutrients, producing new plants, or providing support. Examples include rhizomes, tubers, corms, and bulbs.
Potatoes are considered stems and not roots, because they are the part of the stem of the plant that grows underground, it's the part of the stem that thickens and accumulate starch.
A carrot is the root, just like a potato or onion.