The first formed primary xylem is called ...... and the later formed primary xylem is called (a)...

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The first formed primary xylem is called ...... and the later formed primary xylem is called
(a) metaxylem, protoxylem
(b) protoxylem, xylem fibres
(c) metaxylem, xylem parenchyma
(d) protoxylem, metaxylem
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