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Nady [450]
3 years ago
12

What is a basic difference in the organization of vascular tissue in eudicots when you compare root and shoot tissues?

Biology
1 answer:
vivado [14]3 years ago
6 0

Answer:

  • <u>Roots</u>: Protostele formed by xylem, cambium, and phloem. There is no medulla. Pericycle, endodermis, and Caspary band surrounds the protostele.
  • <u>Shoots</u>: Eustele formed by all the vascular bundles that surround the medulla. Each bundle is composed of xylem, cambium, and phloem.

Explanation:

The vascular and fundamental tissues of shoots normally show a more complex organization than those of the roots.

In dicots´ root, transversal cut shows a <u>protostele</u> which is a <em>solid vascular cylinder surrounded by cortex</em>. The <em>xylem is in the center</em> of the protostele, <em>surrounded by phloem</em>. There are xylem lobules that extend between phloem. Two cell layers are surrounding the protostele, called pericycle and endodermis. Next to the endodermis, there is the Caspary Band, composed of <em>suberin and lignin</em>.

In dicots´ shoots, the vascular system forms independent vascular bundles composed of xylem and phloem. In each bundle, <em>xylem is facing to the center of the shoot, and phloem is facing the exterior</em> of the shoot. All the vascular bundles form a circle around the medulla which is always in the center of the shoot. This organization is known as <u>eustele</u>.  The <em>cortex surrounds the vascular system</em>.

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