Explain the primary structure of monocot root.

Explanation

The internal structure of Monocot root has
(i) Epiblema/Rhizodermis
(ii) Cortex
(iii) Endodermis
(iv) Stele
(i) Epiblema/Rhizodermis:
Outer most layer of monocot root.
Made up of single layer of thin walled, paranchymatous cell.
Root hair helps in absorption of water and minerals.
Stomata and cuticle are absent.
Main function is to protect inner tissue.
(ii) Cortex :
The region below the epidermis is cortex.
Made up of only parenchymatous cells with intercellular space.
It is a multi layer.
Function is to store water and food material. < br> (iii) Endodermis:
Inner most cortex is called Endodermis.
It forms a complete ring around the stele with characteristic Casparian strips and Passage cell.
There is a band like thickening made of suberin casparian strips .

(iv) Stele: Central part inner to endodermis is stele.
It contains Pericycle, vascular bundles and pith.
(a) Pericycle:
Outer most layer of stele made of single layer of tightly arranged Parenchymatous cell.
Function is to originate lateral root.
(b) Vascular bundles:
Radial arrangement of vascular tissue.
Xylem is exarch and polyarch.
The conjuctive tissue is sclerenchymatous tissue.
(c) Pith:
Large central part, composed of parenchyma cells with intercellular spaces.
Function is to store the starch.