Ginger plant has an underground stem which is

$I.$ Bear leaves and branches  $II.$ Conduction of water and minerals   $III.$ Storage of food

These are the functions of

Stolon, offset and rhizome are different forms of stem modifications. How can these modified forms of stem be distinguished from each other ?

Give scientific reasons : Though Ginger is gram in/under the soil. It is a stem not a root.

Mentha $(Mint)$ has one of the following