Internal Structure of Monocot Root Notes | Free Biology Notes

This article we will discuss about Internal Structure of Monocot Root

The transverse section of a monocot Root reveals the following structures

Epiblema / rhizoderm / piliferous layer

• Epiblema is outermost layer & composed of thin-walled, closely packed parenchymatous cells
• The cuticle and stomata are absent
• Most of epidermal cells extend out in form of tubular hairs is called root hairs
• Epiblema has following functions: uptake of water and mineral salts from the soil and provide maximum surface area for absorption

Cortex

• It is present below the epiblema
• Cortex consists of many layers of thin-walled rounded or polygonal parenchymatous cells with intercellular spaces
• Cortex has following functions: store food and conduct water from epiblema to the inner tissues

Endodermis

• This layer is barrel shaped cells present between the pericycle and cortex
• Casparian strips are present on wall of endodermis
• Endodermis has following functions: It is regulate the flow of water and dissolved salts from the cortex to the xylem

Pericycle

• Pericycle present below the endodermis and made up of single layer of thick walled parenchymatous cells
• Pericycle has following functions: Lateral roots arise in this tissue

Vascular tissue

• Vascular tissues are in radial and exarch
• Vascular system consists of alternating strands of xylem and phloem
• The xylem and the phloem are separated by a layer of sclerenchymatous conjunctive tissue.
• Conjunctive tissues help in the storage of food and mechanical support
• Xylem may show exarch & polyarch conditions
• Metaxylem vessels are generally circular in shape