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

1. absence of secondary phloem
2. presence of cortex
3. position of protoxylem
4. absence of secondary xylem

Correct answer: position of protoxylem

Solution

In a dicot root, protoxylem is exarch, meaning it lies toward the periphery of the vascular tissue. In a dicot stem, protoxylem is endarch, so its position is different and this is a key distinguishing feature.

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