JAMB Biology 1986 Question 28

Question 28

Respiration

The equation that can be used to summarize the process of anaerobic breakdown of sugar is

A.C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂
B.6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂
C.C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + energy
D.C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂ + energy.

Show the answer and explanation

Answer: D (C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂ + energy.)

Explanation

Anaerobic breakdown of glucose (as in yeast) gives ethanol and carbon dioxide and releases a little energy. B is photosynthesis and C is aerobic respiration.