A-LevelBiologyGas exchangeMay/June 2015Paper 1 Q311 Mark

What correctly describes the role of elastic fibres in the lungs?

Q: What topic does this question test?

This question tests Gas exchange in A-Level Biology (syllabus code 9700). It is worth 1 mark.

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: They allow the walls of stretched alveoli to recoil as air is breathed out.

📋 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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About This A-Level Biology Question

Topic

This multiple-choice question tests Gas exchange in A-Level Biology (syllabus code 9700). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Biology May/June 2015 examination, Paper 1 Variant 2.

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