The functions of xylem areI. Conduction of water from roots to aerial parts    II. Transport of minerals absorbed by roots to aerial parts.III. Providing mechanical support.IV. Storage of food materials mainly in the form of starch and fat.

The main function of xylem is conduction of water and minerals through its tracheary elements. Cell walls of tracheary elements and fibers are heavily lignified and hence can provide mechanical support. The xylem parenchyma stores food materials in the form of starch and fats.