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
- MERISTEMATIC TISSUE
- PERMANENT TISSUE
Types of Permanent Tissue
- Protective tissue
- Supporting 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:
|Lies just beneath the
bark of the tree.
|Provides 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
|Tubular cells with
perforated walls and arranged end to end.
through perforated walls from one adjacent cell to another.
|Cells are living and
keep their nuclei and other organelles
throughout their life.
|Help to control the
activity of sieve
|1. Elongated, tapering
and dead cells.
2. Cell walls are
|Found particularly in
strength to the plant.
|Cells are alive and
filled with cytoplasm.
|Transports 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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