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Xylem and phloem as part of the vascular bundle in a stem Cambium lies in the middle as undifferentiated tissue and so can form new xylem vessels and phloem tubes at the same time Xylem and phloem compared Phloem Xylem Movement: Bidirectional Unidirectional (upward) Function: Transportation of food and nutrients from leaves to storage organs and growing parts of plant. Water and mineral transport from roots to aerial parts of the plant. Structure: Tubular with soft walled cells Tubular with hard walled cells Occurrence: Roots, stems and leaves Roots, stems and leaves Additional Functions: Forms vascular bundles with xylem Forms vascular bundles with phloem and gives mechanical strength to plant due to presence of lignified cells. Elements: Sieve tubes, companion cells, phloem parenchyma, bast fibers, intermediary cells Tracheids, vessel elements, xylem parenchyma, xylem sclerenchyma Nature of tissue: Living tissue Non living tissue at maturity Picture of a L.S. of a phloem vessel and companion cell Transverse section of root and stems Root Stem