AP BIOLOGY

Detailed explanation-1: -Explanation: In the dicot stem, the vascular bundles are conjoint, collateral and open. In the case of monocot stems, the vascular bundles are arranged in the bundles of xylem and phloem and are dispersed throughout the ground tissue. The vascular bundle in the monocot stem is conjoint, bicollateral and open.

Detailed explanation-2: -Dicot stem The vascular bundles in the stem are arranged around a ring of cambium, which contains cells that divide to expand the girth of the stem. This is similar to the function of the cambium in dicot roots.

Detailed explanation-3: -So, the correct option is ‘Radial, exarch’.