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Answer Posted / anithaisro
In many vascular plants, secondary growth is the result of
the activity of the vascular cambium. The latter is a
meristem that divides to produce secondary xylem cells on
the inside of the meristem (the adaxial side) and secondary
phloem cells on the outside (the abaxial side). This growth
increases the girth of the plant root or stem, rather than
its length, hence the phrase "secondary thickening". As
long as the vascular cambium continues to produce new
cells, the stem or root will continue to grow in diameter.
In woody plants, this process produces wood.
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