plumiTemperature, enzymes and Q10: Edexcel International A Level Biology questions
Edexcel International A Level Biology past-paper questions on 5.4.5 Temperature, enzymes and Q10, 2019–2025, with mark schemes and examiner’s reports where available.
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Q1(a)
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All 9 questions on Temperature, enzymes and Q10, as a list
- January 2025, Unit 6, Q1(a) (6 marks): Describe an experiment to investigate the effect of the concentration of copper ions on the time taken for the brine shrimps to hatch from eggs. (6)
- January 2024, Unit 4, Q2(b)(ii) (2 marks): Calculate the Q10 for the enzymes in C4 plants. Use the formula: R Q t 10 10 R t where Rt is the initial rate of reaction at 10 °C. Give your answer as a whole
- October 2023, Unit 4, Q6(b)(i) (3 marks): There was a positive correlation between temperature and length of young lizards. This could be due to enzyme activity. Explain this correlation. (3)
- October 2023, Unit 6, Q3(f) (1 mark): Some scientists predict that climate change will increase the destruction of crops in East Africa. Suggest one reason why some scientists think this. (1)
- January 2023, Unit 4, Q6(b)(iii) (3 marks): The body temperature of a fish changes with the temperature of its surroundings. Explain why the survival time of fish is reduced at temperatures lower and high
- January 2022, Unit 4, Q6(b)(iii) (2 marks): Describe how a Q10 value for the rate of photosynthesis can be calculated, using this graph. (2)
- October 2021, Unit 4, Q7(a)(iii) (4 marks): Explain the difference in the decrease in relative mass of green tea in teabags buried at 15 °C and 25 °C. Use the information in the graph to support your answ
- January 2021, Unit 4, Q4(c)(ii) (3 marks): Explain the differences in the results obtained for the male and female beetles kept at different temperatures. (3)
- January 2021, Unit 4, Q8(a)(ii) (4 marks): Calculate the Q10 for this enzyme, using the data from this investigation, shown in the first graph. Use the formula Q10 = Rt+10 Rt where Rt is the initial rate
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