Question

A conjoint and open vascular bundle will be observed in the transverse section of

• A. Monocot stem
• B. Dicot root
• C. Dicot stem
• D. Monocot root

Answer 1

The correct option is C Dicot stem

Introduction to conjoint vascular bundle

In plants, there are two vascular bundles: xylem and phloem.

When xylem and phloem tissues are present next to each other along the same radial axis, this arrangement of vascular bundles is called conjoint.

• When cambium is present in between phloem and xylem in a conjoint vascular bundle, it is called conjoint and open vascular bundles.
• When cambium is not present in between phloem and xylem in a conjoint vascular bundle, it is called conjoint and closed vascular bundles.

Explanation

• The roots either of a dicot or monocot plant have radial vascular bundles where xylem and phloem are arranged at different radii in an alternate manner.
• Monocots do not form secondary tissues such as lateral meristem, therefore, cambium is absent in them. Monocot stem has conjoint and closed vascular bundles.
• Dicots have cambium present in them for the growth of lateral tissues. Dicot stem has conjoint and open vascular bundles.

Final answer: Option d. Dicot stem.