As compared to a dicot root, a monocot root has

The vasculature is radial in dicot root i.e., xylem bundles alternate with phloem bundles. Usually vascular bundles are $2-6$ in number while in monocot root the vascular strand consists of several ( 8 or more) alternate radial xylem and phloem bundles. Secondary growth takes place in dicot root while absent in monocot roots and annual rings do not form.