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Plan it with CORMMSS: Design an investigation (Logic Lab).
6.6 Anaerobic respiration by yeast
Exam question
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Link: practise planning on /subjects/igcse-biology/logic-lab/design-an-investigation.
Design an investigation to find out how temperature affects the rate of anaerobic respiration in yeast.
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Total for this question: 6 marks
6.6 Anaerobic respiration by yeast
Exam question
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Explain why a layer of oil is placed on top of the yeast suspension.
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Total for this question: 2 marks
6.6 Anaerobic respiration by yeast
Exam question
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Explain why the glucose solution is boiled and cooled before use.
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Total for this question: 2 marks
6.6 Anaerobic respiration by yeast
Exam question
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Illustrative data.
| Temperature / °C | Volume / cm³ |
|---|---|
| 15 | 2.0 |
| 25 | 5.5 |
| 35 | 9.0 |
| 45 | 6.0 |
| 55 | 0.5 |
Plot the volume of CO₂ against temperature. Join your points with straight lines using a ruler.
(5)Graph skills: SLAPUK and choosing a scale
Write your answer, then press Show model answer and tick each mark point your answer makes. Your answer is not saved.
Total for this question: 5 marks
6.6 Anaerobic respiration by yeast
Exam question
Mark points shown after marking
| Temperature / °C | Volume / cm³ |
|---|---|
| 15 | 2.0 |
| 25 | 5.5 |
| 35 | 9.0 |
| 45 | 6.0 |
| 55 | 0.5 |
Calculate the rate of CO₂ production at 35 °C in cm³ per minute.
(2)Total for this question: 2 marks
6.6 Anaerobic respiration by yeast
Exam question
Mark points shown after marking
| Temperature / °C | Volume / cm³ |
|---|---|
| 15 | 2.0 |
| 25 | 5.5 |
| 35 | 9.0 |
| 45 | 6.0 |
| 55 | 0.5 |
Explain the results between 35 °C and 55 °C.
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Total for this question: 3 marks
6.6 Anaerobic respiration by yeast
Exam question
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Suggest why counting bubbles is less accurate than using a gas syringe.
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Total for this question: 2 marks
6.6 Anaerobic respiration by yeast
Exam question
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Identify the indicator that turns from red to yellow when CO₂ is produced.
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Total for this question: 1 mark
