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

A) Absence of secondary phloem
B) Presence of cortex
C) Position of protoxylem
D) Absence of secondary xylem
Explanation

[Solution from source] Even after secondary growth, a dicot root keeps exarch protoxylem (towards the periphery), whereas the stem has endarch protoxylem (towards the centre). Both old root and stem have secondary xylem and phloem, so their presence or absence cannot distinguish them. Answer (3).

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.

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