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Question : Vascular cylinder in dicot stems occurs in the form of distinctly separated vascular bundles. But, in some dicot stems, e.g. Linum, Lonicera, it appears to be a continuous cylinder because

Answer»

interfasciular region is not developed at all
the interfascicular region is there, but its cells are not differentiable from the cells of vascular BUNDLES
interfacicular region is extremely NARROW
continuous vascular cylinder differentiates since, the EARLY STAGE of development

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