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A concentric vascular bundle in which the xylem completely surrounds the phloem is termed:
AAmphicribral
BCollateral
CAmphivasal
DRadial
Answer & Solution
Correct answer: C. Amphivasal
1. Concentric bundles have one vascular tissue completely surrounding the other.
2. They are of two kinds, amphivasal and amphicribral.
3. When xylem surrounds phloem the bundle is amphivasal, as in Dracaena.
4. So the correct term is amphivasal.
5. Option A amphicribral is the reverse, phloem surrounding xylem, the trap.
6. Option B collateral is a conjoint type with both on one radius, so it is wrong.
7. Option D radial has the tissues on alternating radii, so it is ruled out.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 12 Plant Anatomy and Plant Physiology "Concentric Bundles", p.181_
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