What is the location of protoxylem in a dicot stem?
GeneralClass 12AllAnswered 27 Mar 2026
Answer
Protoxylem lies towards the centre (pith) in dicot stems.
Advanced Explanation: This arrangement is called endarch condition (proto = first; endo = inside). The sequence of xylem differentiation is:
Protoxylem (innermost, smaller vessels) → Metaxylem (outermost, larger vessels)
Contrast with Roots: In roots, protoxylem is exarch (towards periphery), which is a diagnostic feature distinguishing stem and root anatomy.
NEET Application: Examiners often ask to identify sections based on protoxylem location.
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