Which one of the following is a xerophytic plant in which the stem is modified into the flat,green,and succulent structure?

Rhizomes can be differentiated from roots by:

What type of stem does $Zamia$ $pygmaea$ possess?

Phylloclade is a modification of

The rhizome of ginger resembles the roots of other plants as it grows underground. Despite this fact,ginger is a stem and not a root. Justify.

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.