Primordial vessels members have dense cytoplasm with prominent nucleus. Xylem is the dead permanent tissue that carries water and minerals from roots to all other parts of the plant.



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It is the specialized tissue of vascular plants that transports water and nutrients from the plant soil interface to stem and leaves and provides mechanical support and storage.

Xylem vessel cell diagram. The secondary xylem vessels are formed from cells of vascular cambium. It included the elements excepting the fibres. Of the above mentioned elements only the parenchyma cells are living and the rest are dead.

Xylem formation begins when the actively dividing cells of growing root and shoot tips apical meristems give rise to primary xylemin woody plants secondary xylem constitutes the major part of a mature stem or root and is formed as the plant expands in girth and builds a ring of new xylem around the original primary xylem tissues. It carries water absorbed by roots from soil to different parts of the plant body. In vascular bundles present in non woody plants and non woody.

Xylem also contains two other cell types. Transports water and minerals from the roots up the plant stem and into the leaves. In a mature flowering plant or tree most of the cells that make up the xylem are specialised cells called vessels.

When this happens the primary xylem cells die and lose. Tracheids and vessel elements are distinguished by their shape. Vessels secondary cell wall is laid down by the content of primordial cell.

While xylem is made up of tracheids and vessels phloem is made up of sieve tubes which have many holes for transporting nutrients. A term hadrome was once used for xylem. The term xylem is derived from the greek word xylon meaning wood.

Xylem can be found. The structure of xylem and phloem is also different. Xylem tissue is made of some living and dead cells.

Vessel elements are shorter and are connected together into long tubes that are called vessels. The most distinctive xylem cells are the long tracheary elements that transport water. The term xylem is derived from the greek word xylon meaning wood.

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Mature xylem is made up of dead cells that do not have cell contents while phloem contains living cells albeit without nuclei. Initials of vessels in both cambia are called primordial vessel members. The tissues composing xylem are tracheids tracheae or vessels fibres called xylem fibres or wood fibres and parenchyma referred to as xylem or wood parenchyma.



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