Biology, asked by msubbhas, 8 months ago

describe the internal structure of a dicot root​

Answers

Answered by ToxicVoid
7

Explanation:

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

Answered by Anonymous
13

The transverse section of the dicot root shows the following plan of arrangement of tissues from the periphery to the centre.

Rhizodermis or epiblema:

The outermost layer is made up of single layer of parenchymatous cells without intercellular spaces. Stomata and cuticle are absent.

Root hairs are always single celled.

2. Cortex:

Cortex consists of oval or rounded loosely arranged parenchymatous cells.

These cells may store food reserves.

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

Pericycle is generally 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.

The tissue by which xylem and phloem are separated is called conjunctive tissue.

Xylem showes exarch and tetrarch condition .

Metaxylem vessels are generally polygonal in shape

5. Pith: Usually absent

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