Vascular cambium of stem is

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(A) The vascular cambium in the stem is considered to be partly primary and partly secondary in origin.$1$. The intrafascicular cambium,which is prese

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Partly primary and partly secondary meristem

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(A) The vascular cambium in the stem is considered to be partly primary and partly secondary in origin.$1$. The intrafascicular cambium,which is present between the xylem and phloem of the vascular bundles,is primary in origin as it originates from the procambium.$2$. The interfascicular cambium,which develops from the medullary rays during secondary growth,is secondary in origin.Therefore,the complete vascular cambium ring is formed by the combination of both primary and secondary meristematic tissues.

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