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B
Endarch
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C
Mesearch
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D
None of the above
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Solution
The correct option is D None of the above Xylem formation begins when the actively dividing cells of growing root and shoot tips (apical meristems) give rise to primary xylem. In woody plants, secondary xylem constitutes the major part of a mature stem or root and is formed as the plant expands in girth and builds a ring of new xylem around the original primary xylem tissues.