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WAEC Biology 2014 Question 20

Question 20

Transport in Plants

Older parts of plant roots do not normally absorb water because

  1. A.they lack xylem.
  2. B.they have small surface area.
  3. C.the phloem is dead.
  4. D.they lack root hairs.
Show the answer and explanation

Answer: D (they lack root hairs.)

Explanation

Water is absorbed mainly through root hairs near the tip; older parts have no root hairs and are covered with cork.