Question

formation of secondary xylem.

Answer 1

Xylem conducts water and minerals from the roots to the leaves.It is made mostly of dead cells.These are either tracheids or vessels and some sclerenchymatous cells.There are some parenchymatous cells ,too.These are the only living living cells in the Xylem tissue.Vessels and tracheids are elongated cells,with thick,lignified (covered with lignin)walls.They are hollow and join each other end to end.They thus form something like a long pipe,through which water moves up.Xylem runs through the centre of the stem