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JAMB Biology 1990 Question 22

Question 22

Transport in Plants

If a ring of bark and phloem is removed from a stem, the

  1. A.plant dies immediately
  2. B.plant dies after two days
  3. C.movement of food is not affected
  4. D.movement of mineral salts is hardly affected
Show the answer and explanation

Answer: D (movement of mineral salts is hardly affected)

Explanation

Ringing removes the phloem but leaves the xylem, so water and mineral salts still move up; only food transport is cut.