A-LevelBiologyGas exchangeOct/Nov 2024Paper 1 Q341 Mark
The electron micrograph shows some of the airways in the gaseous exchange system of an insect and the respiring body cells that surround them. Which statements describe correct differences between the insect gas exchange system shown in the electron micrograph and the human gas exchange system? 1 Gas exchange occurs through the walls of the airways directly into respiring body cells in insects but this does not occur in humans. 2 There are spirals of chitin in the walls of a trachea in insects to hold it open but not in humans. 3 There is more than one trachea in the gas exchange system of the insect but only one in humans.
A1, 2 and 3
B1 and 2 only
C2 and 3 only
D3 only
✓ Correct Answer
The correct answer is A: 1, 2 and 3
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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