Phloem ~ Types, Location, Function

Cell: A cell is the basic structural and functional unit of a living organism. Example: Nerve cell.
Tissue: A tissue is a group of cells having a common origin, similar structure and function and held together by a cementing substance. Example: Connective tissue.
Organ: Different types of tissues working together and contributing to some specific function inside the body constitute an organ. Example: Stomach.
Organ system: Different organs coordinate to perform a specific life process and form an organ system. Example: Digestive system.
Organism: Various organ systems working simultaneously together constitute an organism. Example: Plants. In this article we are going to learn only about Phloem.

Classification of plant tissues


Types of Permanent Tissue

  • Protective tissue
  • Supporting tissue
  • Conducting tissue

Conducting tissue

Conducting tissues are also called vascular tissue. Conducting tissues are Present in the stem, roots and leaves. Conducting tissue Provide a passage for water and dissolved materials to move up and down in the plant body.

Types of Conducting tissue:

  • Xylem
  • Phloem


permanent tissue.
LOCATIONLies just beneath the
bark of the tree.
FUNCTIONProvides a passage for the downward
movement of food
manufactured in the leaves to various parts of the plant.

Components of Phloem

  • Sieve tubes
  • Companion Cells
  • Phloem fibres
  • Phloem parenchyma

Sieve tubes

CHARACTERISTICSTubular cells with
perforated walls and arranged end to end.
FUNCTIONTranslocation of
organic substances
through perforated walls from one adjacent cell to another.

Companion cells

CHARACTERISTICSCells are living and
keep their nuclei and other organelles
throughout their life.
FUNCTIONHelp to control the
activity of sieve
tube elements.

Phloem fibres

CHARACTERISTICS1. Elongated, tapering
and dead cells.
2. Cell walls are
LOCATIONFound particularly in
the stem.
FUNCTIONProvide mechanical
strength to the plant.

Phloem parenchyma

CHARACTERISTICSCells are alive and
filled with cytoplasm.
FUNCTIONTransports food i.e. sugars and amino acids from the leaves to other non-green
parts of the plants, such as growing stems and roots.


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