NEET Biology question

Anatomically a 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 protoxylemCorrect

Answer: (D)

Solution

Even in a fairly old dicot root that has undergone secondary growth, the primary arrangement can still be traced near the centre: in the root, the protoxylem lies towards the periphery (exarch), whereas in the stem, the protoxylem

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Question ID VK-105338