It is a complex tissue composed of many types of cells. Xylem can be defined as a complex tissue that is composed of four basic types of cell (tracheids, trachea, and xylem fibre and xylem parenchyma), remains in close association with phloem and has specialized functions like conduction of water and solutes, and mechanical strength. The term xylem was proposed by Nageli (1858) and he derived the word from a Greek word ‘xylos’ meaning wood. It is responsible for replacing water lost through transpiration and photosynthesis. In eudicots, the xylem usually forms a cross of cells within the stele which runs the length of the root. The main function of xylem is to transport water and some soluble nutrients including minerals and inorganic ions upwards from the roots to the rest of the plant . 4. The xylem and phloem are grown within the central section of a root called a ‘stele’. Xylem transports water and soluble mineral nutrients from roots to various parts of the plant. The xylem is one of the conductive tissues in plants. All vascular plants have tracheids, which are less specialized but have a special cell wall known as a pit membrane. 3. Functions of Xylem and Phloem. Xylem vessels are made up of cells known either as tracheids or vessel members. Explore the major difference between the two. Functions of xylem:Conductive tissue: moving water from the roots through the stems to the leaves. 2. Water entering via osmosis can originate from xylem- but sugars do not enter xylem. The main function of xylem cells is to carry water and soluble minerals from the root to the leaves of a plant. What is xylem? Phloem translocates sugars made by photosynthetic areas of plants to storage organs like roots, tubers or bulbs. Xylem cells form long tubes that transport materials and the mixture of water and nutrients that flows through the xylem cells is called xylem sap. Xylem and phloem together constitute the conducting tissues in plants. High [sugar] and thus lower [water] in sieve cells results in osmosis of water from outside sieve cells into the sieve cells. Increased pressure at site of phloem loading and osmosis causes flow in sieve cells that is away from site of phloem loading. Xylem is one of the two types of transport tissue in vascular plants (phloem is the other). Four independent phloem strands grow between each bar of the xylem cross. Xylem and phloem in roots. However, a secondary function of xylem tissue is to provide support for the plant. 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