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Plant anatomy — radial vascular bundles: Identify the arrangement that defines a radial vascular bundle. In this bundle type (typical of roots), xylem and phloem occur on separate, alternating radii rather than together in the same strand. Choose the correct description.

Difficulty: Easy

Correct Answer: Xylem and phloem occur on different, alternating radii (typical of roots) — radial

Explanation:


Given data

  • Asked: definition of radial vascular bundle.
  • Context: classification of vascular bundle arrangements.


Concept / Approach
In radial bundles, xylem and phloem are in separate strands arranged on alternate radii of the organ. This is characteristic of roots. By contrast, in conjoint bundles (typical of stems/leaves), xylem and phloem lie together on the same radius.


Elimination
Options describing conjoint, amphicribral, or bicollateral arrangements do not match the root-type alternating pattern.


Final Answer
Xylem and phloem occur on different, alternating radii (radial).

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