Question

Rearrange the following in a proper logical sequence.
Epidermis, Cortex, Root Hair, Xylem, Endodermis.

Answer 1

Hint:- In vascular plants, the roots form an important portion. The roots provide anchorage to the plants. They help in the absorption of the water and minerals from the soil. Moreover, the food produced during the photosynthesis is also stored in the roots for future use.

Complete Answer:-The outer layer of root is known as the epidermis. Both the ground tissues as well as the vascular tissues are surrounded by the epidermal layer. The primary function of epidermis is to provide protection to the underlying tissues. It also aids in absorption. These epidermal cells of the roots are lined by the extensions known as the root hairs. This root hair increases the absorption of water and minerals by increasing the root’s surface area. On the inner side of the root, the ground tissues are present which are formed of two regions, namely the cortex and the pith. A large cortex and small pith is present in the roots as compared to the cells of the stem. Products of photosynthesis are stored in the two regions of the ground tissues. Pith lies inner to the cortex region. In the inner portion of the root, vascular tissues are arranged. This is known as the stele. Endodermis is a layer of cell which separates steel from the ground tissues. The endodermal cells act as check points for the entry of various materials to the vascular system of the root.
The sequence of various layers of cells present in the root from inner to outer side is root hair, epidermis, cortex, endodermis, and xylem.

Note:- Casparian strips are present in the endodermal region of the root. These are the waxy strips which allow the movement of water molecules to the vascular tissue (xylem) of the cell. This ensures the entry of only those solute particles that are needed by the roots. Pathogens and toxins are barred.