Question

When xylem is present at the same radius in a stem or root, what is this arrangement called?

• A. Radial
• B. Conjoint
• C. Open
• D. Close

Hint:

In stems, xylem and phloem are conjoint, meaning they share the same radius, while in roots, they are arranged radially, in separate radii.

Answer 1

The Correct Option is B

Step 1: Understanding vascular arrangement.
In plants, the vascular bundles consist of xylem and phloem tissues that transport water, nutrients, and sugars. The arrangement of xylem and phloem varies between roots and stems. In roots, the xylem and phloem are arranged in a radial pattern, where they are positioned at different radii, typically with xylem in the center and phloem on the outside. In contrast, in stems, xylem and phloem are arranged in conjoint bundles, where both tissues share the same radius.
Step 2: Explanation of options.
- Radial: Refers to xylem and phloem arranged in separate radii, a typical feature in roots. - Conjoint: Refers to xylem and phloem arranged together at the same radius, typically seen in stems. This is the correct arrangement for the question. - Open: This term is not related to the arrangement of xylem and phloem but may refer to open vascular bundles in certain contexts. - Close: Similar to "open," this term is not typically used to describe the vascular bundle arrangement.
Step 3: Conclusion.
Thus, the arrangement where xylem and phloem are present at the same radius in a stem or root is called conjoint, corresponding to option (b).