why root posses endarch condition ?
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Whereas in exarch condition, the protoxylem develops from the outermost procambial cells and progresses inwards. ... During root-stem transition, the arrangements of xylem and phloem changes which leads to the endarch condition in stem which was initially exarch in root.
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When protoxylem is pointing towards periphery, it is called as exarch xylem and when it is pointing towards the centre, it is called as endarch. So, polyarch and exarch vascular bundles are the characteristic of monocot root and not of dicot stem (endarch), dicot root (exarch) and monocot stem (endrach xylem).
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