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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?

1. Secondary xylem
2. Secondary phloem
3. Protoxylem
4. Cortical cells

Correct answer: Protoxylem

Solution

Protoxylem is arranged differently in dicot stem and dicot root, so it is a reliable distinguishing feature. In roots it is exarch, while in stems it is endarch.

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