[Campbell Biology P.823] Refer to Figure 35.22, "Anatomy of a tree trunk." Which layer is co... | Practice Question

Refer to Figure 35.22, "Anatomy of a tree trunk." Which layer is correctly identified as being responsible for transporting xylem sap, and is also the outermost layer of secondary xylem?

  • A: Heartwood
  • B: Sapwood
  • C: Vascular cambium
  • D: Secondary phloem

Explanation

Figure 35.22 labels 'Sapwood' as part of the 'Secondary xylem' and the text further clarifies that 'The newest, outer layers of secondary xylem still transport xylem sap and are therefore known as sapwood.'