Practice C1.2 Cell respiration with authentic IB Biology exam questions for both SL and HL students. This question bank mirrors Paper 1A, 1B, 2 structure, covering key topics like cell biology, genetics, and ecology. Get instant solutions, detailed explanations, and build exam confidence with questions in the style of IB examiners.
Paper
Level
Question 1
SLPaper 1A
A student measures the rate of yeast respiration by collecting CO₂ in a syringe over time. What is the best unit to express the result?
Question 2
SLPaper 1A
Which is the correct word equation for anaerobic respiration in humans?
Question 3
SLPaper 1A
Which comparison between aerobic and anaerobic respiration in animal cells is correct? The table shows key differences between aerobic respiration and lactic acid fermentation in muscle cells.
| Feature | Aerobic | Anaerobic |
|---|---|---|
| Oxygen required? | Yes | No |
| ATP yield | High | Low |
| Waste product | CO₂ + H₂O | Lactic acid |
Question 4
HLPaper 1A
The graph shows ethanol concentration increasing over time during anaerobic fermentation by yeast. A researcher introduces an inhibitor of alcohol dehydrogenase at hour 4.
Which of the following trends would you expect to observe after this point, and why?
Question 5
SLPaper 1A
Which of the following correctly compares aerobic and anaerobic respiration?
| Feature | Aerobic Respiration | Anaerobic Respiration |
|---|---|---|
| Location | Cytoplasm and mitochondria | Cytoplasm only |
| Oxygen required | Yes | No |
| ATP yield | High | Low |
| End product | CO₂ and water | Lactic acid |
Question 6
SLPaper 1A
Which statement best describes cell respiration?
Question 7
SLPaper 1A
What is required to synthesize ATP from ADP and phosphate?
Question 8
SLPaper 1A
Which of the following changes require an energy input?
| Number | Reaction |
|---|---|
| 1 | ATP → ADP + phosphate |
| 2 | ADP + phosphate → ATP |
| 3 | Hydrolysis of ATP |
| 4 | Formation of ATP in mitochondria |
Question 9
SLPaper 1A
A student grows yeast at different temperatures and measures CO₂ release. At which temperature would you expect the highest rate of respiration?
| Temperature (°C) | CO₂ per minute (mL) |
|---|---|
| 10 | 0.3 |
| 20 | 1.1 |
| 37 | 2.4 |
| 50 | 0.5 |
Question 10
SLPaper 1A
A respiration experiment shows that 60 mL of CO₂ was produced over 5 minutes. What is the rate of respiration?