The important functions of the vascular tissues are:
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The xylem vessels and the tracheids conduct water and dissolved minerals in the upward direction.
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The xylem parenchyma cells are concerned with the storage of the starch.
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The walls of the xylem cells are thick and so they give mechanical support.
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The phloem cells are concerned with the conduction of the organic food.
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The phloem parenchyma also takes up the storage function.