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Anatomically fairly old dicotyledonous root is distinguished from the dicotyledonous stem by
A. absence of secondary xylem
B. absence of secondary phloem
C. presence of cortex
D. position of protoxylem

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Correct Answer - d
In dicotyledonous root , the condition of xylem is exarch as the protoxylem is away from the centre and metaxylem is towards the centre . In dicotyledonous stem , (e.g .Cucurbita), the condition of xylem is endarch as the metaxylem is away from the centre and protoxylem is towards the centre.

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