Wood Formation · Botany

What happens to the primary xylem as wood formation continues over many years?

  1. It becomes part of the outer bark
  2. It is pushed toward the pith and crushed
  3. It gradually transforms into secondary phloem
  4. It is shed through the lenticels
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Correct answer: It is pushed toward the pith and crushed

As the vascular cambium adds layers of secondary xylem toward the inside, the original primary xylem is pushed further into the center of the stem near the pith.

Difficulty: Medium Question 13 of 20

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