Wood Anatomy: Sapwood and Heartwood · NCERT Biology

The mechanical strength of wood is mainly due to:

  1. Sapwood tissue alone
  2. Heartwood tissue alone
  3. Both sapwood and heartwood
  4. Phloem, bark, and cork layers combined
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Correct answer: Both sapwood and heartwood

Both sapwood and heartwood consist of lignified xylem elements. Together, they provide mechanical support to the plant.

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