NEET 2023 Phase 2 · BiologyPolyarch xylemPrevious Year Question
The transverse section of a plant part showed polyarch, radial and exarch xylem, with endodermis and pericycle. The plant part is identified as :
Answer: (C) Monocot root. Answer: (C) Monocot root.
- A.Dicot stem
- B.Monocot stem
- C.Monocot root✓
- D.Dicot root
Correct Answer
(C) Monocot root
Solution & Explanation
Answer: (C) Monocot root. Solution: A polyarch condition (more than six xylem bundles) along with radial and exarch xylem and the presence of endodermis and pericycle is diagnostic of a monocot root. Dicot roots are typically di- to tetrarch (two to four xylem patches), while stems have conjoint, endarch vascular bundles, so the description rules them out. NCERT Reference: NCERT Class XI, Ch 6 Anatomy of Flowering Plants, p.74, line ~33: "there are usually more than six (polyarch) xylem bundles in the monocot root".
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