Explain Secondary Growth in Roots - QS Study
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Secondary Growth in the dicot root, the vascular cambium is completely secondary in origin. It originates from the tissue located just below the phloem bundles, a portion of pericycle tissue, above the protoxylem forming a complete and continuous wavy ring, which later becomes circular (Figure). Further events are similar to those already described above for a dicotyledon stem.

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Figure: Different stages of the secondary growth in a typical dicot root

Secondary growth also occurs in sterns and roots of gymnosperms. However, secondary growth does not occur in monocotyledons.