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You are given a fairly old piece of dicot stem and a dicot root. Which of the following anatomical structures will you use to distinguish between the two?
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- Secondary xylem
- Secondary phloem
- Protoxylem
- Cortical cells
Correct Option: C
Anatomically fairly old dicotyledonous root is distinguished from the dicotyledonous stem by position of the 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.
