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7.25 Diagrammatic devclopmem of the roO[ in a woody dicoryledOD 3$ seen in<br />
TS. A, just behind the root apex a cenual cylinder of procambium (I I, is<br />
separated by the single-layered endodermis (2) from the cortex (3) and epidumis<br />
(4). B, beyond the root hair zone the mature primary root shows a te:trarch<br />
xylem (5) separated fcom the: phloem strands (6) by narrow arcs of vascular<br />
cambium. (7). C. the vascular cambium has differentiated latcrally from the<br />
pericyclc (8) and now encloses the x}'lem. The vas
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