Question

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

• A. Position of protoxylem
• B. absence of secondary xylem
• C. Absence of secondary phloem
• D. Presence of cortex

Answer 1

The correct option is A Position of protoxylem

In the dicotyledonous roots, the protoxylem is located near the periphery of the vascular cylinder. It means away from the centre (exarch condition) and the metaxylem is towards the centre. In the dicotyledonous stem, the protoxylems are located near the centre of vascular bundle means endarch condition and the metaxylem are away from the centre. So, anatomically fairly old dicotyledonous root. One can distinguish it from the dicotyledonous stem by its position of protoxylem.

So, the correct answer is 'Position of protoxylem'.

The correct option is A.