A-LevelBiologyGas exchangeMay/June 2015Paper 1 Q311 Mark
What correctly describes the role of elastic fibres in the lungs?
AThey allow the walls of stretched alveoli to recoil as air is breathed out.
BThey increase in the walls of alveoli as a result of the release of the enzyme elastase.
CThey increase in the walls of the alveoli as emphysema develops.
DThey prevent the walls of the alveoli from collapsing as air is breathed in.
✓ Correct Answer
The correct answer is A. This question tests the candidate's understanding of gas exchange within the Biologysyllabus. The examiner's mark scheme requires...
📋 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...
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