in which of the following type of habit of plant main trunk may disappear after some time (1) excurrent (2) caudex (3) culm (4) deliquescent

The given options are about the types of modification in trunk or stem.
Not the names of habitat.
The xerophytes or desert living plants exhibit this type of modification where they loose the trunk and modifies the trunk intoo phyllode cladofil,phylloclade etc.,