Correct option is A
The correct answer is (a).
In monocot roots, the vascular bundles are typically polyarch, meaning there are several xylem and phloem strands in the root, forming a circular arrangement. These bundles often have a large, well-developed pith in the center. The arrangement of vascular tissue and the presence of a well-developed pith are key features of monocot roots, distinguishing them from dicot roots.
Incorrect options
(b) is incorrect because vascular bundles are not always hexarch . Hexarch is just one of the polyarch types.
(c) is incorrect as diarch vascular bundles are typical in some dicot roots, not monocots, and pith is not necessarily small or absent in monocots.
(d) is incorrect because while monocots often have polyarch vascular bundles, the pith is generally present and well-developed rather than absent.
