Permanent tissue
Permanent tissues are those that have lost the ability to divide cells. As they mature, "permanent tissue" cells take on a specific shape, size, and function. Permanent tissues are divided into three categories based on their constituents: simple, complicated, and secretory or special tissues.
Simple tissues and Complex tissues
(1) Simple tissues: This type of tissue is composed of the same type of cells.
These are again of four types:
(a) Parenchyma simple tissues: Cells of parenchyma tissues are live. They are oval, elongated, and loosely packed with large intercellular space, forming basic packing of tissue, and are found throughout the plant body.
Functions of parenchyma:
They provide mechanical support to the plant body.
They store food and nutrients in vacuoles.
Chlorenchyma: Parenchyma with chlorophyll which performs photosynthesis is called chlorenchyma.
Aerenchyma: In aquatic plants, cells of parenchyma have large air cavities to give buoyancy to the plant, and is called aerenchyma.
(b) Collenchyma simple Tissues: Cells of collenchyma are live. They are oval and elongated and tightly packed with no inter-cellular spaces. They are found below the epidermis in leaves and stems.
Read more about Class 9 science Permanent tissues
Learn Meristematic and permanent tissue with animated videos. Click on Class 9 Science for details.
