They may be produced with other xylem vells at the end of the growing season. Phloem, like xylem, is comprised of several specialized cells like sieve tubes, companion cells, phloem fibers, and phloem parenchyma. They have thin cell walls, large vacuoles, prominent nucleus, and protoplasts. Transportation of minerals, solutes and water etc. Xylem parenchyma is the only living tissue amongst the consituents of xylem. It gives mechanical support when turgid. The term ‘xylem’ is derived from the Greek word ‘xylon’, meaning wood. Phloem is the other type of transport tissue; it transports sucrose and other nutrients throughout the plant.Xylem and phloem give vascular plants their classification; they are the vascular tissues that transport substances throughout the plant. In xylem, the flow of food towards the parts is unidirectional, from the root to the upper part of the plant, whereas the flow of material in the phloem is bidirectional. Xylem Definition. These cells are also living cells and are not lignified. The xylem parenchyma is comprised of parenchyma cells. They have differing shapes although they are usually cylindrical and lobed in form. Phloem has only one dead tissue, i.e., phloem fibers. 2.Phloem . On contrary to this situation, phloem have three types of living tissues, viz., sieve tube cells, companion cells and phloem parenchyma. Xylem parenchyma is mainly concerned with storage of starch, fat and ergastic substances etc. Parenchyma cells are the only living cells in the xylem. The cells provide mechanical support to plants. The only living tissue in plant xylem is xylem parenchyma. Xylem tissue is located in the center of the vascular bundle. The cell wall is thin and made up of cellulose. The xylem parenchyma cells store food reserves in the form of starch and fat. Xylem tissues have unidirectional movement; the water and mineral are only moved up from the roots. xylem parenchyma: live plant cells that are short, lignified and generally thin walled. Xylem parenchyma is the only living element of xylem and all elements except fibres are living elements of parenchyma.☺☺ Xylem is composed of dead cells and only living parenchyma cells, whereas the phloem is composed of living … Xylem is a type of tissue in vascular plants that transports water and some nutrients from the roots to the leaves. Sieve tubes are columns of sieve-tube cells with perforations on the lateral wall through which the food substances travel. Phloem, on the other hand, is the living, permanent tissue that carries food and other organic nutrients from leaves to all other parts of the plant. Parenchyma containing chloroplasts are called, Parenchyma containing large air cavities are called. Xylem tissue is encased in lignin, the substance that creates the strength of wood, causing the protoplasm (living part of the cell) to die, and therefore be dead tissue; phloem is living tissue. Xylem parenchyma possesses living protoplast and contains starch, fat, crystals and tannins, and sometimes chlorophyll also. They surround conducting elements and assist directly or indirectly in the conduction of water upwards through vessels and tracheids, and also serve for food storage. Three of the four elements of xylem are dead (viz., tracheids, vessels and fibres). A) Xylem parenchyma cells are living and they store food. Like xylem, phloem is also a complex tissue. Xylem is the dead, permanent tissue that carries water and minerals from roots to all other parts of the plant. They also assist in conduction of water. occur through it. All other three types of tissue, viz., xylem fibers, vessels and tracheids are dead. 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