Tissues in the phloem are living tissues but matured Xylem cells are dead.
Water and
mineral salts are transported from the root hair cell to the Xylem.
Nevertheless, Xylem is responsible for restoring water lost by
means of transpiration and photosynthesis.
In plants, both the Xylem and phloem make up vascular tissues
and mutually form vascular bundles.
Boron participates in Xylem formation, boron fertilizer is beneficial to transport water
and inorganic salt from root to upland part.
The ferns and other pteridophytes and the gymnosperms have only Xylem tracheids,
while the flowering plants also have Xylem vessels.
However, it is uni-directional in the Xylem which means it is only an ascendant movement
from the root to other tissues.
The bryophytes lack true Xylem tissue,
but their sporophytes have a water-conducting tissue known as the hydrome that is composed of elongated cells of simpler construction.
The latter shows the presence of parenchyma inside a layer of Xylem, while presence of Xylem as the innermost tissue is
a characteristic feature of the protostele.