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Vascular Tissue
The vascular tissue system in plants is formed by the xylem and phloem acting as a transport system for water and other essential nutrients. The two kinds of xylem cells are tracheids and vessel members. Xylem cells are dead at functional maturity. There are holes, or perforations between cells for water to pass through. Phloem functions mainly in the transport of sugars and is made up of adjacent cells called sieve tube members. Phloem cells are still alive at functional maturity.