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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 / ApproachIn 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.

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

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

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