location of primary xylem and phloem and secondary xylem and phloem
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Primary xylem originates from the procambium during primary growth while secondary xylem has its origin in vascular cambium during secondary growth. Phloem has sieve tubes, companion cells, bast fibers as its elements. Phloem originates from meristematic cells in vascular cambium- primary phloem from apical meristem and secondary phloem from vascular cambium.
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