Vascular Tissue · Botany

Which statement best describes collateral vascular bundles?

  1. Xylem completely surrounds the phloem on every side
  2. Phloem completely surrounds the xylem on every side
  3. Xylem and phloem lie on one radius, phloem usually outside
  4. Xylem and phloem alternate on completely separate vascular radii
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Correct answer: Xylem and phloem lie on one radius, phloem usually outside

In collateral vascular bundles, xylem and phloem lie on the same radius. In many stems, the phloem is positioned toward the outside and the xylem toward the inside.

Difficulty: Medium Question 10 of 20

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