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WAEC Biology 2013 Question 27

Question 27

Transport in Plants

Conduction of water and mineral salts through the xylem vessels is enhanced because the xylem cells are

  1. A.thickened with lignin.
  2. B.long, narrow tubes placed end to end.
  3. C.close to the endodermis.
  4. D.centrally placed in the roots.
Show the answer and explanation

Answer: B (long, narrow tubes placed end to end.)

Explanation

Xylem vessels are long, narrow, hollow tubes joined end to end with no cross walls, so water flows up easily.