NEET 2009 Biology question

Anatomically fairly old dicotyledonous root is distinguished from the dicotyledonous stem by:

(1)Absence of secondary phloem
(2)Presence of cortex
(3)Position of protoxylemCorrect
(4)Absence of secondary xylem

Answer: (3)

Solution

In an old dicot root and an old dicot stem both show secondary growth (secondary xylem and phloem are present in both) and both have a cortex, so options (1), (2) and (4) cannot distinguish them. The difference is in primary xylem: in the

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Question ID VK-090228