Questions on Anaerobic and Aerobic Respiration
20 multiple-choice questions (MCQs) with five alternatives (A–E) about Anaerobic and Aerobic Respiration. The correct answers are provided at the end.
Multiple Choice Questions: Anaerobic and Aerobic Respiration
1. What is the main difference between aerobic and anaerobic respiration?
A) Aerobic uses light; anaerobic uses darkness
B) Aerobic requires carbon dioxide; anaerobic does not
C) Aerobic requires oxygen; anaerobic does not
D) Anaerobic produces ATP; aerobic does not
E) Anaerobic requires sunlight
2. What is the final electron acceptor in aerobic respiration?
A) Glucose
B) NAD⁺
C) Carbon dioxide
D) Oxygen
E) Water
3. In which cellular organelle does aerobic respiration occur?
A) Nucleus
B) Cytoplasm
C) Ribosome
D) Mitochondrion
E) Golgi apparatus
4. What is the net ATP yield from one molecule of glucose in aerobic respiration?
A) 2
B) 18
C) 24
D) 32
E) 36–38
5. What is a common product of anaerobic respiration in human muscle cells?
A) Ethanol
B) Carbon dioxide
C) Water
D) Lactic acid
E) Oxygen
6. Which of the following is an end product of anaerobic respiration in yeast?
A) Lactic acid
B) Ethanol
C) Pyruvate
D) Acetyl-CoA
E) Oxygen
7. Where does anaerobic respiration primarily occur in the cell?
A) Mitochondria
B) Nucleus
C) Ribosomes
D) Cytoplasm
E) Chloroplast
8. Which process occurs in both aerobic and anaerobic respiration?
A) Krebs cycle
B) Glycolysis
C) Electron transport chain
D) Chemiosmosis
E) Calvin cycle
9. Which of the following organisms can perform anaerobic respiration?
A) Yeast
B) Humans
C) Bacteria
D) All of the above
E) Only bacteria
10. Which of these best describes anaerobic respiration?
A) Produces more ATP than aerobic respiration
B) Uses oxygen to break down glucose
C) Occurs in the mitochondria
D) Produces less ATP and no water
E) Releases large amounts of energy
11. Which gas is released during aerobic respiration?
A) Oxygen
B) Nitrogen
C) Hydrogen
D) Carbon dioxide
E) Methane
12. During strenuous exercise, what causes muscle soreness?
A) Oxygen overload
B) ATP accumulation
C) Lactic acid buildup
D) Carbon dioxide reduction
E) Glucose deficiency
13. Which of the following is NOT a product of aerobic respiration?
A) Water
B) ATP
C) Lactic acid
D) Carbon dioxide
E) Energy
14. Which of the following processes does NOT require oxygen?
A) Aerobic respiration
B) Electron transport chain
C) Anaerobic respiration
D) Krebs cycle
E) Oxidative phosphorylation
15. What is the main purpose of cellular respiration (both aerobic and anaerobic)?
A) To produce glucose
B) To break down fats
C) To synthesize proteins
D) To generate ATP
E) To form DNA
16. Which of these is more efficient in ATP production?
A) Anaerobic respiration
B) Fermentation
C) Aerobic respiration
D) Photosynthesis
E) Lactic acid pathway
17. How many ATP molecules are produced per glucose in anaerobic respiration?
A) 36
B) 38
C) 2
D) 24
E) 4
18. Which pathway produces ethanol and carbon dioxide from pyruvate?
A) Krebs cycle
B) Lactic acid fermentation
C) Alcoholic fermentation
D) Electron transport
E) Calvin cycle
19. Why do cells switch to anaerobic respiration?
A) When glucose is unavailable
B) When ATP levels are high
C) When oxygen is limited or absent
D) To produce water
E) To increase lactic acid
20. What is the main disadvantage of anaerobic respiration?
A) It requires oxygen
B) It is slower than aerobic respiration
C) It produces toxic glucose
D) It yields less ATP
E) It damages mitochondria
- +20 Questions on Fermentation
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Answer Key
1. C
2. D
3. D
4. E
5. D
6. B
7. D
8. B
9. D
10. D
11. D
12. C
13. C
14. C
15. D
16. C
17. C
18. C
19. C
20. D
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