Question

what do you mean by concentric vascular bundle

Answer 1

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       A vascular bundle in which phloem encircles the central strand of xylem is called as amphicribralbundle, also known as hadrocentric bundle. Ex. Selaginella. The concentric bundles, either amphivasal or amphicribral, are closed as there is no cambium in between xylem and phloem.

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Answer 2

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The conjoint vascular bundle, in which one type of vascular tissue is surrounded by the other, is called concentric vascular bundle.