In $Luffa$,the tendrils are modified:

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.

In mint,vegetative propagation occurs through ..........

The bulb of $Allium \ cepa$ (Onion) is:

In Onion,the swollen underground structure is

Potatoes develop on