Question

Separate xylem and phloem bundles are known as
A) Radial
B) Amphivasal
C) Collateral
D) Bicollateral

Answer 1

Vascular bundles consist of xylem and phloem. Xylem is responsible for transport of water and solutes from one part to another part of the plant. Phloem is responsible for translocation of food from one region to another region in plants.

Complete answer:
Vascular bundles are defined as the conducting strands present in the plants. There are two types of complex tissue present in vascular bundles:

Xylem: This complex tissue is responsible for translocation of water and ions across from root to above parts. This is an example of unidirectional flow of water and minerals.
Phloem: This complex tissue transports food across the plant parts. Bidirectional is found in the phloem tissue.
Amphivasal vascular bundles are those arrangements in which xylem surrounds the phloem part. That’s why option B is incorrect.
Collateral vascular bundles are those vascular bundles in which xylem and phloem lie on the same radius. That’s why option C is incorrect.
Bicollateral vascular bundles are those vascular bundles in which phloem is found on both sides and xylem is inside. That’s why option D is incorrect.
Radial arrangement of vascular bundles involves the arrangement of xylem and phloem on different radii and they are found in alternate with each other.

Such arrangement is found in the roots and it is the most primitive type of vascular bundles. That’s why the right option is A.

Note: Vascular bundles are the conducting strand because they are responsible for conducting the substances across the plant tissue. Xylem is unidirectional in nature because it translocates ions and water from root to the other parts. Whereas phloem is bidirectional because it transports food from root to leaf or leaf to root.