Question

Anatomically, fairly old dicot root is distinguished from dicot stem by

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

Answer 1

The correct option is A Position of proto xylem

Roots and stems distinctly show exarch and endarch conditions respectively. When the protoxylem is aligned towards the periphery, it is called exarch condition. While an endarch condition is when protoxylem is present towards pith as found in the stem. This helps in distinguishing between stem and root

Thus, the correct answer is 'Position of proto xylem.'