Minerals are taken by the roots from the soil and are transported to various parts of the plants wherever needed via the xylem vessels. The mineral requirement is not same for all plants and neither for all plant parts so all the parts of the plants do not get the same amount of minerals. Growing parts of the plants usually require more of the minerals. Minerals exit the xylem and by diffusion gets into the cells where they are needed. Places where concentration of minerals is already higher, these minerals are taken there by active transport.