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WAEC Biology 1992 Question 18

Question 18

Transport in Plants

Which of the following can be used to detect the loss of water vapour from the leaves of plants?

  1. A.Hydrated copper sulphate
  2. B.Blue litmus paper
  3. C.Red litmus paper
  4. D.Blue cobalt chloride paper
  5. E.Lead acetate paper
Show the answer and explanation

Answer: D (Blue cobalt chloride paper)

Explanation

Dry cobalt chloride paper turns from blue to pink when it absorbs water.