Stem tendrils occur in

Rhizomes that grow vertically upwards are known as:

Although potato tuber is an underground part,it is considered as a stem. Give two reasons.

Which is not a modification of stem?

In $Amorphophallus$ and $Colocasia$ $(Araceae)$, an extremely enlarged underground vertical stem meant for vegetative reproduction and storage is:

$A$ disc-like reduced stem is found in