Yes.
Onion is an underground modified stem.
no
Carrot, Sugarcane, Turnip & Onion all these are underground stem.
A subterranean stem is another word for an underground stem. They exist under the soil surface. There are many types of subterranean stems such as bulbs, corm, and stolon.
Rhizome
The tuber family is actually a part of the plant family. The characteristics of the tuber family is that they were grown underground & it has swollen underground stem. Potatoes, yam & sweet potatoes etc. are from the tuber family because they were grown underground & it has swollen underground stem.
yam is propagated by tubers
No but its mostly a stem. The Yam plant has leaves and roots but the food is the stem of the plant. If you are talking about the food, yes but if you are talking about the plant, no.
Root.
Onion is an underground modified stem.
root
TurnipTurnip is a bulbA bulb is an underground stem
it produces by underground stem
underground root
no
Carrot, Sugarcane, Turnip & Onion all these are underground stem.
Yes yam can easly be reproduced by suckers. These plants have underground rhizomes and frequently develop suckers for vegetative reproduction.