Parenchyma, Collenchyma and Sclerenchyma tissues are the parts of simple permanent tisse. These are also called supporting tissue. These tissues provide support to the plant.
1. Parenchyma:- The Parenchyma tissue is found in the roots, stems and leaves of the plants. Parenchym tissue cells are thin walled, living and have intercellular space. Their shape may be oval, spherical or cylindrical.
These cell with Chloroplasts found in leaves. It helps in Photosynthesis. Parenchema tissues also store food.
2. Collenchyma:- The Collenchyma tissue is found below the epidermis in young stems and petioles of leaves. Collenchyma tissue cells are circular, oval or polygonal is shape. These cells have thicker primary cell wall than Parenchyma wall cells.
The corners of these cell thickened due to the presence cellulose and pectin. In cell generally intercellular space are absent. These tissue provides structural support to growing stems and leaves.
3. Sclerenchyma tissues:- Sclerenchyma tissue is found in the stem and the veins of leaves. These cells are generally dead and do not contain any protoplasm. Sclerenchyma tissue cells are long with tapering ends. Its wall is thickened all around due to the presence of lignin.
Sclerenchyma consists two types of cells, sclerenchyma fibre and sclereids. This tissue provides mechanical strength to the stem.
