Thorn is a stem structure because it

From which of the following does the stem tendril develop?

The axillary buds arise:

The stem in turmeric is ........

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

In $Banana$,the true stem is underground. The stem-like structure outside the soil is formed by: