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In a radial vascular bundle, how are xylem and phloem arranged?
AOn the same radius, side by side
BOn different radii, alternating with each other
CXylem completely surrounding the phloem
DPhloem completely surrounding the xylem
Answer & Solution
Correct answer: B. On different radii, alternating with each other
1. Vascular bundles are classified by the relative positions of xylem and phloem.
2. In a radial bundle the xylem and phloem sit on separate radii.
3. They alternate with one another around the axis.
4. This alternating pattern is typical of roots, so option B fits.
5. Option A, side by side on one radius, describes a conjoint bundle, not radial.
6. Option C, xylem surrounding phloem, is the amphivasal concentric type.
7. Option D, phloem surrounding xylem, is the amphicribral concentric type.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 12 Plant Anatomy and Plant Physiology "Radial Bundles", p.181_
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