Download Xylem and phloem as part of the vascular bundle

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Transcript
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