IGCSE Biology – Aerobic & Anaerobic Respiration
Worksheet
1. Key Definitions
• Aerobic respiration: The release of energy from glucose using oxygen.
• Anaerobic respiration: The release of energy from glucose without oxygen.
2. Equations
a) Write the word equation for aerobic respiration:
b) Write the word equation for anaerobic respiration in:
• Animals:
• Yeast (fermentation):
3. Compare Aerobic vs Anaerobic Respiration
Feature
Aerobic Respiration
Anaerobic Respiration
Large / Small
Large / Small
Oxygen needed?
Energy released
Products in animals
+
Products in yeast
+ energy
+ energy
+ energy
+
+ energy
4. Multiple Choice Questions
1. Which respiration releases more energy? (a) Aerobic (b) Anaerobic
2. During vigorous exercise, muscles may run short of oxygen. Which type of respiration happens?
(a) Aerobic (b) Anaerobic
3. In yeast, anaerobic respiration produces: (a) Lactic acid (b) Alcohol + Carbon dioxide (c) Water +
Oxygen
5. Short Answer Questions
1. Why do muscles get tired after anaerobic respiration?
2. Give one use of anaerobic respiration in industry.
3. Explain why athletes breathe faster after exercise.
6. Extension (for stronger students)
Draw and label a diagram to show the difference between aerobic and anaerobic respiration.