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In a dicot root, the xylem is described as EXARCH because:
AXylem is on the outside; phloem at the centre
BXylem and phloem alternate in the same bundle ring
CXylem is fully fused into a single solid mass
DProtoxylem is outside (toward periphery) than metaxylem
Answer & Solution
Correct answer: D. Protoxylem is outside (toward periphery) than metaxylem
EXARCH xylem: protoxylem (first-formed) is closer to the PERIPHERY; metaxylem (later) is closer to the CENTRE. Found in ROOTS. Opposite = ENDARCH (protoxylem inside) found in STEMS.
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