proto xylem and metaxylem explain endocrine and exocrine conditions of xylem
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In stems, the protoxylem lies towards the centre (pith) and the
metaxylem lies towards the periphery of the organ. This type
of primary xylem is called endarch. In roots, the protoxylem
lies towards periphery and metaxylem lies towards the centre.
Such arrangement of primary xylem is called exarch.
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