How is a vascular cambium formed during secondary growth in a dicot root?

Dear student,
Vascular cambium is absent in the beginning but develops later at the time of secondary growth. The parenchyma cells present just below the primary phloem become meristematic cells which give rise to 4 separate strips of cambia. The divisions of the cells of the pericycle results in complete cambial ring formation. The strips of cambia cut off cells on their both sides. Xylem towards inside and phloem towards outside. They mature into secondary xylem and secondary phloem respectively.

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Cambium, plural Cambiums, orCambia, in plants, layer of actively dividing cells between xylem (wood) and phloem (bast) tissues that is responsible for the secondary growth of stems and roots (secondary growth occurs after the first season and results in increase in thickness).
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