Vascular Tissue · Botany

Which cells in phloem are living at maturity but lack a nucleus in angiosperms?

  1. Sieve tube elements
  2. Xylem tracheid cells
  3. Xylem vessel elements
  4. Xylem fiber cells
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Correct answer: Sieve tube elements

Angiosperm sieve tube elements are living at maturity but lose their nucleus and many organelles. They rely on companion cells for important metabolic functions.

Difficulty: Medium Question 18 of 20

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