WAEC Biology 2013 Objective — Question 27
Question 27 of 60 from the West African Examinations Council (WAEC) Biology 2013 Objective paper, with the correct answer and a full explanation.
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Conduction of water and mineral salts through the xylem vessels is enhanced because the xylem cells are
- A. thickened with ligninCorrect
- B. long, narrow tubes placed end to end, close to the endodermis
- C. centrally placed in the roots
- D. made of large cells with thin walls
Explanation
The walls of the xylem are strengthened with lignin to withstand pressure changes as water and mineral salts move through the plant.
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