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Anatomically fairly old dicotyledonous root is distinguished from the dicotyledonous

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

Options

(a) absence of secondary phloem
(b) presence of cortex
(c) position of protoxylem
(d) absence of secondary xylem

Correct Answer:

position of protoxylem

Explanation:

Anatomically fairly old dicotyledonous root is distinguished from the dicotyledonous stem by position of protoxylem. In dicot root the protoxylem is located near the periphery of the vascular cylinder while in dicot stem the protoxylem is located near the centre of vascular bundle i.e. the xylem is endarch.

AIPMT2009
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