The onion is sprouting or trying to grow, if it were placed in the soil it would develop roots as well
A onion is a modified stem
Onion is a modified stem because it is a stem which grows underground
Onion is an underground modified stem.
Onion roots emerge from the base of the condensed stem.
Onions are alliums and they are bulbs that grow underground.
An onion, strictly speaking, is a 'bulb' and is a stem.
Carrot, Sugarcane, Turnip & Onion all these are underground stem.
stem
white
The rounded stem of Onion is called Bulb. It is the modification of stem which becomes disc like and have plenty of fleshy scales.
its a bulb
aerial stem