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CAIE IGCSE Biology 12.3 Anaerobic Respiration

Practise anaerobic-respiration questions on oxygen shortage, yeast fermentation, muscle lactic acid, energy yield and oxygen-debt recovery.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • compare anaerobic with aerobic respiration by oxygen use, energy yield and products
  • distinguish yeast glucose -> alcohol + CO2 from muscle glucose -> lactic acid
  • explain oxygen debt as lactic acid moved to the liver and respired aerobically

Covered syllabus points

12.3.1—Anaerobic respiration as the chemical12.3.2—Anaerobic respiration releases much12.3.3—Word equation for anaerobic12.3.4—Word equation for anaerobic12.3.5—Anaerobic respiration equation12.3.6—Lactic acid builds up in muscles12.3.7—How the oxygen debt is removed after

12.3 Anaerobic respiration question 1

[Maximum number: 1]

Which statement about both aerobic and anaerobic respiration is correct?

A

They break down C6H12O6\mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6}.

B

They produce an oxygen debt.

C

They use CO2\mathrm{CO}_{2}.

D

They use O2\mathrm{O}_{2}.

12.3 Anaerobic respiration question 2

[Maximum number: 1]

Which statement about anaerobic respiration is correct?

A

Anaerobic respiration requires oxygen and releases less energy per glucose molecule than aerobic respiration.

B

Anaerobic respiration requires oxygen and releases more energy per glucose molecule than aerobic respiration.

C

Anaerobic respiration does not require oxygen and releases less energy per glucose molecule than aerobic respiration.

D

Anaerobic respiration does not require oxygen and releases more energy per glucose molecule than aerobic respiration.

12.3 Anaerobic respiration question 3

[Maximum number: 1]

What is the word equation for anaerobic respiration in yeast?

A

glucose → alcohol + carbon dioxide

B

glucose → alcohol

C

glucose → lactic acid + carbon dioxide

D

glucose → lactic acid

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