Write a short note about vascular bundle of Dicot root.
Answers
Answer:
Vascular bundles:
(a) It is in the form of several alternate and radial xylem and phloem bundles.
(b) The number is 20-30 in maize.
(c) In many cases the vascular bundles are embedded in a cylinder of sclerenchymatous conjunctive tissue. (d) The vascular bundles are arranged in the form of ring around a central pith.
(e) The xylem bundles are exarch, i.e., protoxylem lies towards the outside while the metaxylem faces inward. Because of the presence of numerous xylem bundles and exarch condition, xylem of monocot root is polyarch.
(f) Xylem is made up of rounded or oval vessels, and are narrow.
(g) Xylem provides mechanical strength and helps in the conduction of water and mineral salts.
(h) Phloem bundles alternate with the xylem bundles. These two are separated from each other by means of narrow strip of conjunctive tissue.
(i) Monocotyledonous roots do not undergo any secondary growth.
Answer:
Vascular bundles in dicot root are radial and exarch in condition.
Vascular bundles are two to six in numbers.
Metaxylem is present towards the center and protoxylem lies towards the periphery.
Conjunctive tissue a type of parenchymatous tissue is present between xylem and phloem.
And this conjunctive tissue forms a vascular cambium.
Explanation:
Vascular bundles consisting of xylem and phloem is a means of transportation of food and water in plants.
Xylem transports water and phloem transports food.