Phloem · Botany

Which comparison between xylem and phloem is correct?

  1. Xylem mainly transports sugars, while phloem mainly transports water
  2. Xylem cells are usually dead at maturity, while phloem sieve tubes stay alive
  3. Both xylem and phloem transport materials only in a single fixed direction
  4. Phloem tissue contains vessel elements, while xylem tissue contains sieve plates
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Correct answer: Xylem cells are usually dead at maturity, while phloem sieve tubes stay alive

Xylem conducting elements such as tracheids and vessel elements are generally dead at maturity. Phloem sieve tube elements are living at maturity, although they lack a nucleus in angiosperms.

Difficulty: Medium Question 19 of 20

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