$A$ bulb is a modified:

Identify the given figure:

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

The lateral branches originate from the basal and underground portion of the main stem,grow horizontally beneath the soil and then come out obliquely upward giving rise to leafy shoots.

Describe the modifications of the stem for photosynthesis.

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