plumiImplementation and measurements: Edexcel International A Level Biology questions
Edexcel International A Level Biology past-paper questions on P.1.3 Implementation and measurements, 2019–2025, with mark schemes and examiner’s reports where available.
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Q3(a)(iii)
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All 14 questions on Implementation and measurements, as a list
- June 2025, AS Unit 3, Q3(a)(iii) (2 marks): Describe the difference between a result obtained from a quantitative test and a result obtained from a semi‑quantitative test. (2)
- June 2025, AS Unit 3, Q3(b)(ii) (3 marks): Describe how to determine the total mass of starch present in section B of this root. (3)
- October 2024, AS Unit 3, Q2(b)(i) (2 marks): Suggest why shoot dry mass is a more accurate measure than the length of a fresh shoot. (2)
- October 2024, AS Unit 3, Q3(b)(i) (2 marks): Explain how the area of the zone of inhibition could be measured accurately. (2)
- June 2024, AS Unit 3, Q1(e) (4 marks): Describe a method for estimating the soluble protein concentration in the beakers in step 4. (4)
- June 2024, AS Unit 3, Q3(b)(i) (2 marks): The diagram shows a graduated pipette. The pipette was used to prepare the suspension of bacteria. Describe how to use a graduated pipette to measure an accurat
- January 2024, AS Unit 3, Q3(a)(iii) (1 mark): A semi‑quantitative test was used to estimate the protein concentration in a solution. A set of standards was produced using dilutions of egg white containing p
- October 2022, Unit 6, Q2(a)(i) (1 mark): Describe how 20 cm3 of caffeine solution with a concentration of 200 mg dm–3 could be prepared. (1)
- June 2022, AS Unit 3, Q1(c)(i) (3 marks): Describe how you would make 10 cm3 of a 0.4 mol dm−3 sucrose solution using these two solutions. (3)
- January 2022, AS Unit 3, Q3(b)(i) (2 marks): Explain how a 0.4 mol dm−3 solution could be made from a 1.0 mol dm−3 sucrose solution. (2)
- October 2021, AS Unit 3, Q3(c)(ii) (3 marks): Suggest how the initial rate of reaction could be measured in this investigation. (3)
- June 2021, AS Unit 3, Q2(b)(v) (2 marks): The graph does not show the standard deviations of the means for mitotic index. Describe how the investigation could be modified to allow standard deviations to
- October 2020, AS Unit 3, Q2(a)(vii) (3 marks): Suggest how the initial rate of this reaction could be determined. (3)
- June 2019, AS Unit 3, Q1(b)(ii) (2 marks): These results suggest that the optimum concentration of sucrose for pollen grain germination is 40 g dm–3. Explain how the method could be modified to find the
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