Introduction
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 Xylem.
Classification of plant tissues
- MERISTEMATIC TISSUE
- PERMANENT TISSUE
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
Xylem:
| CHARACTERISTICS | 1. Complex permanent tissue with thick-walled cells. 2. Most of the cells are dead. |
| LOCATION | Present in the stem, roots and leaves. |
| FUNCTION | Provides upward movement of water and dissolved materials absorbed by the root from the soil to other parts of the plant. |
Components of it :
- Tracheids
- Xylem vessels
- Xylem parenchyma
- Xylem fibres
Tracheids:
| CHARACTERISTICS | Made up of elongated cells with flat, tapering ends. |
| FUNCTION | Provide a network of hollow and connected cells for the transport of water. |
Xylem vessels:
| CHARACTERISTICS | 1. Consist of dead cells. 2. They are tubular structures and are much wider than tracheids. |
| FUNCTION | Allow free flow of water and minerals in the vertical direction from the roots to the leaves. |
Xylem parenchyma:
| CHARACTERISTICS | Consists of living parenchyma cells associated with xylem. |
| FUNCTION | Stores food in the plant body. |
Fibres:
| CHARACTERISTICS | Separated by thin cross walls. |
| FUNCTION | Mainly support the plant. |
YOU MAY READ Epithelial tissue
Follow us