Xylem · Botany

In tree anatomy, 'Sapwood' is the region of xylem that is:

  1. Non-functional and dark in color
  2. The innermost part of the trunk
  3. Functionally active in water transport
  4. Composed mostly of secondary phloem layers
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Correct answer: Functionally active in water transport

Sapwood (alburnum) is the younger, outer layer of secondary xylem. Unlike heartwood, sapwood contains living parenchyma and is actively involved in the upward transport of water.

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