Question

In a monocot root, vascular bundles are ____.

• A. Conjoint, collateral, open
• B. Conjoint, collateral, closed
• C. Radial, polyarch
• D. Radial, diarch

Hint:

Use this simple breakdown to avoid confusion between roots and stems: - Roots always have Radial bundles. - Stems always have Conjoint bundles. - Monocot root = Polyarch (Many bundles, $>6$).

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Root anatomy fundamentally differs from stem anatomy regarding how xylem and phloem alternate around the central axis.

Step 2: Detailed Explanation:

• Radial Arrangement: In all roots (both monocot and dicot), xylem and phloem are arranged in an alternating manner on different radii.
• Polyarch Condition: In a monocot root, the number of separate xylem bundles is highly numerous, usually more than six (polyarch). In contrast, dicot roots generally have fewer xylem bundles (two to four, termed diarch to tetrarch).

Step 3: Final Answer:
In a monocot root, the vascular bundles are radial and polyarch.