Vegetative propagation in mint occurs through . . . . . . .

$A$ 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:

In $Ruscus$,the stem is modified into ........

Mentha $(Mint)$ has one of the following:

In ginger,vegetative propagation occurs through

In $Opuntia$,the stem is modified into a flattened green structure to perform the function of leaves (i.e.,photosynthesis). Cite some other examples of modifications of plant parts for the purpose of photosynthesis.