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Q. Assertion Radial vascular bundle is the characteristic of majority of the roots including dicots and monocots.
Reason Monocot stem is characterised by colletral open vascular bundle.

AIIMSAIIMS 2013

Solution:

Radial vascular bundles are characteristic of majority of the roots. In this type of vascular bundle xylem and phloem are arranged on separate radius while in monocot stem the vascular bundle is collateral and closed.