Ginger is a .......

$A$ sucker,which is a subaerial stem modification for vegetative propagation,is seen in:

What is the function of the stem?

In $Duranta$,axillary buds and in $Carissa$ the apical bud is modified into stem thorns. What is correct for $Ulex$? It has

Assertion: Ginger has a prostrate growing rhizome.
Reason: Shoot growth is not affected by gravity.

$A$ non-green stem branch that grows obliquely or sometimes grows horizontally inside the soil and then comes out of the soil as a leafy shoot is called: