Discussion
In Angiosperms, normally 'Exarch Xylem' occurs in
Answer: C
Exarch xylem normally occurs in the dicot root.
'Exarch' means the protoxylem lies toward the outside, next to the pericycle, and the metaxylem develops toward the centre, so the xylem matures centripetally. This is the arrangement of the radial vascular bundles of roots, in dicots and monocots alike.
Stems, whether dicot or monocot, have endarch xylem: the protoxylem faces the pith and maturation proceeds outward. The veins of a leaf continue the stem's bundles, with the xylem on the upper side and the protoxylem innermost, so a dicot leaf is not exarch either.
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