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How many type of Stele are formed on basis of number of xylems?

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1.Protostele = solid core of xylem, has no pith, no leaf gaps

2. Siphonostele = hollow cylinder of xylem, has pith, has leaf gaps

3. Eustele = xylem and phloem located in vascular bundles, sympodia, has pith, does not have leaf gaps.

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