Wood Anatomy: Sapwood and Heartwood · NCERT Biology

The conversion of sapwood to heartwood occurs due to:

  1. Secondary growth in phloem
  2. Ageing of inner xylem cells
  3. Increase in cambial activity
  4. Primary growth of stem
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Correct answer: Ageing of inner xylem cells

As xylem elements age, their conducting function is lost. This ageing process converts sapwood into heartwood.

Difficulty: Medium Question 16 of 20

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