Question

describe the internal structure of monocot root ??​

Answer 1

Answer:

It lies just below the epidermis. Cortex consists of thin walled multilayered parenchyma cells having sufficiently developed intercellular spaces among them. Usually in an old root of Zea mays, a few layers of cortex undergo suberization and give rise to a single or multi-layered zone- the exodermis

Answer 2

Answer:

1. Rhizodermis or epiblema

The outermost layer of parenchymatous cells without intercellular spaces. Stomata and cuticle are absent.

Root hairs are always single celled.

2. Cortex

The cortex is homogenous, consists of oval or rounded loosely arranged parenchymatous cells.

The function of cortical cells is storage.

3. Endodermis

It is made up of single layer of barrel shaped parenchymatous cells.

The radial and the inner tangential walls of endodermal cells are thickened with suberin. These thickenings are known as casparian strips.

But these casparian strips are absent in the endodermal cells which are located opposite to the protoxylem elements.

4. Stele: All the tissues present inside endodermis comprise the stele.

A. Pericycle:

A single layer of parenchymatous cells found inner to the endodermis. Lateral roots originate From the pericycle.

B. Vascular system

Vascular tissues are in radial arrangement.

Xylem and phloem are separated by sclerenchymatous conjunctive tissue.

Xylem shows exarch and polyarch condition.

Metaxylem vessels are generally circular in shape.

5. Pith:

The central portion is occupied by a large pith consist of thin walled parenchyma cells with intercellular spaces.

These cells are filled with abundant starch grain.

Explanation:

Hope this may help you...

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