Which structure is not found in the leaves of a bean plant?

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.

Horizontal branched rhizome is called straggling rhizome. It can be monopodial or sympodial. Monopodial rhizome is found in

Runner is

Stem modified into green,flattened branches of unlimited growth for assimilatory function is

Give scientific reasons: Although ginger grows under the soil,it is a stem,not a root.