Question

Read the following statements about the vascular bundles

1. In roots, xylem and phloem in a vascular bundle are arranged in an alternate manner along the different radii.
2. Conjoint closed vascular bundles do not possess cambium
3. In open vascular bundles, cambium is present in between xylem and phloem
4. The vascular bundles of dicotyledonous stem possess endarch protoxylem
5. In monocotyledonous root, usually there are more than six xylem bundles present

Choose the correct answer from the options given below:

• A. (a), (b) and (d) only
• B. (b), (c), (d) and (e) only
• C. (a), (b), (c) and (d) only
• D. (a), (c), (d) and (e) only
• E. All the options are correct.

Answer 1

Answer: (E)

The question involves understanding the arrangement and characteristics of vascular bundles in plants. Let's analyze each statement:

1. In roots, xylem and phloem in a vascular bundle are arranged in an alternate manner along the different radii: This describes the typical arrangement in roots, known as radial vascular bundles, which is a characteristic feature of the arrangement in the root system.
2. Conjoint closed vascular bundles do not possess cambium: This is true for most monocots, where the vascular bundles are closed (i.e., no cambium is present between xylem and phloem).
3. In open vascular bundles, cambium is present in between xylem and phloem: Open vascular bundles, typically found in dicots, have a cambium layer that allows for secondary growth.
4. The vascular bundles of dicotyledonous stem possess endarch protoxylem: This is true for dicot stems, where endarch protoxylem develops towards the center.
5. In monocotyledonous root, usually there are more than six xylem bundles present: This statement describes a characteristic of monocot roots, which often have polyarch (many) xylem bundles.

Considering these explanations, all the statements accurately describe features of vascular bundles in different plant parts. Therefore, the correct option is:

All the options are correct.