plumiGas exchange surfaces and Fick's law: Edexcel International A Level Biology questions
Edexcel International A Level Biology past-paper questions on 2.1.1 Gas exchange surfaces and Fick's law, 2019–2025, with mark schemes and examiner’s reports where available.
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Q4(a)
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All 23 questions on Gas exchange surfaces and Fick's law, as a list
- June 2025, AS Unit 1, Q4(a) (3 marks): The gas exchange surfaces of a frog change as a tadpole develops into an adult frog. The graph shows some of these changes. 100 80 lungs Percentage of 60 oxygen
- June 2025, AS Unit 1, Q4(c) (6 marks): The diagram shows the distribution of blood flowing through the circulatory system of a frog. The percentages of blood flowing through the parts of the circulat
- October 2024, AS Unit 1, Q1(b)(i) (1 mark): The amoeba can be roughly spherical, as shown in Shape 1. Which is the surface area of the amoeba in this shape? Use the formula: surface area of a sphere = 4πr
- October 2024, AS Unit 1, Q1(b)(ii) (1 mark): The mass of the amoeba stays the same when it changes from Shape 1 to Shape 2. Which row of the table shows what happens to the surface area and volume of this
- October 2024, AS Unit 1, Q1(b)(iii) (2 marks): Explain why an amoeba can rely on diffusion to supply the oxygen it needs. (2)
- June 2024, AS Unit 1, Q4(b)(i) (1 mark): Name two other factors that affect the rate of diffusion. (1) 1 2
- June 2024, AS Unit 1, Q4(b)(ii) (1 mark): Name the law of diffusion that can be used to calculate the rate of diffusion. (1)
- June 2024, AS Unit 1, Q4(c)(i) (2 marks): Complete the table to show the missing values. (2)
- June 2024, AS Unit 1, Q4(c)(ii) (3 marks): Explain why it is important for body cells to be close to capillaries to meet the demands of respiration. Use the information in the question and the table to s
- June 2023, AS Unit 1, Q4(a)(ii) (1 mark): Which is the surface area, in mm2, of this hydra? Use the formula: surface area = 2πrl (1) A 0.9 π B 1.8 π C 3.6 π D 5.4 π
- June 2023, AS Unit 1, Q4(a)(iii) (2 marks): Another hydra has a surface area of 2.3 π mm2, a body length of 1.8 mm and a diameter of 1.2 mm. Calculate the surface area to volume ratio of this hydra. Use t
- June 2023, AS Unit 1, Q4(b) (3 marks): A hydra has a hollow body that is made up of two layers of cells. Explain how a hydra is adapted for gas exchange. (3)
- January 2023, AS Unit 1, Q7(b) (3 marks): Explain why large lungs and a large heart would help a yak to survive at high altitudes. (3)
- January 2023, AS Unit 1, Q7(c)(ii) (2 marks): The diagram gives some information about two spheres, sphere A and sphere B. Sphere A Sphere B 8 mm 16 mm • sphere A has a surface area : volume ratio of 1 : 1.
- October 2022, AS Unit 1, Q5(a) (1 mark): Name the law on which this formula is based. (1)
- October 2022, AS Unit 1, Q5(b) (1 mark): What will happen to the rate of diffusion if all three of the following are changed at the same time? • the surface area is halved • the concentration gradient
- October 2022, AS Unit 1, Q5(d) (6 marks): The photograph shows a hellbender salamander. skin folds (Source: © Robert Hamilton/Alamy Stock Photo) These salamanders live in freshwater streams that are sha
- October 2021, AS Unit 1, Q4(b)(i) (2 marks): The length of the head of a butterfly is 4 mm, the thorax is 6 mm and the abdomen is 18 mm. Estimate the surface area to volume ratio of the butterfly. Assume t
- October 2021, AS Unit 2, Q2(a)(i) (2 marks): Calculate the surface area : volume ratio of one cube with a length of 2.5 cm. (2) Answer
- January 2021, AS Unit 1, Q6(a)(ii) (2 marks): Smoking is a cause of emphysema. People with emphysema have weakened alveoli that can collapse, creating fewer but larger alveoli. Explain how this will affect
- January 2021, AS Unit 1, Q6(b) (6 marks): Bird embryos develop inside hard-shelled eggs. Gas exchange occurs across the shell of the egg. The oxygen diffuses into the bloodstream of the developing embry
- June 2019, AS Unit 1, Q7(d)(ii) (2 marks): The red blood cells of the giraffe are about one third the size of human red blood cells, so that they can pass through the very narrow capillaries. The small s
- January 2019, AS Unit 1, Q8(a) (2 marks): The height of a mouse is 3 cm. Calculate how many times taller an elephant is than a mouse. Use the white line drawn on the photograph of the elephant to calcul
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