Solution:

In woody dicot roots, the primary xylem and phloem show the presence of an interfascicular cambium, which is created from the cells of the medullary rays linking the interfascicular cambium. As a result, the continuous cambium ring emerges. The cambium separates from freshly produced cells on both sides, whereas cells closer to the outside differentiate into secondary phloem. The cells separate and detach from the pith, forming secondary xylem. In comparison to secondary phloem, secondary xylem is generated in excess.

Secondary growth in plants increases the girth of the plants, as well as the water content and nutrients, in order to aid the ever-growing leaves and provide support to the plants.