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WAEC Biology 2012 Question 33

Question 33

Respiration

The diagram is an illustration of an experimental set-up to test the action of yeast. What test would be used to confirm the nature of the gas given off at I?

Diagram for this question
  1. A.Insert a glowing splint
  2. B.Pass the gas through lime water
  3. C.Insert a piece of litmus paper
  4. D.Smell the gas
Show the answer and explanation

Answer: B (Pass the gas through lime water)

Explanation

Yeast fermenting sugar gives off carbon dioxide, which turns lime water milky.