plumiThe gas exchange system: CAIE A‑Level Biology questions
Every CAIE A-Level Biology exam question on 9.1 The gas exchange system, June 2024 and the specimen papers, with its mark scheme and examiner’s report.
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Q4(a)(i)
The whole paper ↗![June 2024 Paper 2, question 4(a)(i): Name the cells labelled A and B in Fig. 4.1. A B [2]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/970021-jun24-04-ai-qp.webp)
Q4(a)(ii)
The whole paper ↗![June 2024 Paper 2, question 4(a)(ii): Describe how the tissue shown in Fig. 4.1 is adapted to its function in the gas exchange system. [3]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/970021-jun24-04-aii-qp.webp)
Q2(b)
The whole paper ↗
All 9 questions on The gas exchange system, as a list
- June 2024, Paper 1, Q30 (1 mark): How are alveoli adapted to their function? A They contain squamous epithelium for a short diffusion distance. B They contain goblet cells to produce mucus. C Th
- June 2024, Paper 1, Q31 (1 mark): The diagram shows oxygen diffusing from the space inside an alveolus into the blood through the gaseous exchange surface. thickness of alveolar wall and capilla
- June 2024, Paper 1, Q32 (1 mark): Which tissues are present in a bronchus? ciliated smooth cartilage epithelium muscle A key B = present C = not present D
- June 2024, Paper 1, Q33 (1 mark): Steep concentration gradients must be maintained for efficient gaseous exchange to occur in the human lungs. Which row correctly describes how steep concentrati
- June 2024, Paper 2, Q4(a)(i) (2 marks): Name the cells labelled A and B in Fig. 4.1. A B [2]
- June 2024, Paper 2, Q4(a)(ii) (3 marks): Describe how the tissue shown in Fig. 4.1 is adapted to its function in the gas exchange system. [3]
- Specimen, Paper 1, Q37 (1 mark): What maintains the necessary concentration gradients for carbon dioxide and oxygen in the lungs? A good ventilation of the lungs B large surface area of the alv
- Specimen, Paper 1, Q38 (1 mark): Which cells and tissues are present in the trachea? ciliated epithelium cartilage A B D C goblet cells
- Specimen, Paper 2, Q2(b) (3 marks): A healthy person has other defence mechanisms in the gas exchange system to prevent bacteria entering cells. Describe these defence mechanisms and explain how b
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