A-LevelBiologyTransport in mammalsMay/June 2018Paper 1 Q301 Mark

Which statement explains why the ventricles contract after the atria?

Q: What topic does this question test?

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

AThe band of fibres between the atria and the ventricles conducts the excitation wave slowly.

BThe excitation wave has to pass through a small area of conducting fibres in the septum.

CThe excitation wave has to travel further to reach the base of the ventricles than to spread across the atria.

DThe excitation wave travels slowly through the Purkyne tissue to reach the base of the septum.

✓ Correct Answer

The correct answer is B: The excitation wave has to pass through a small area of conducting fibres in the septum.

📋 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 Transport in mammals in A-Level Biology (syllabus code 9700). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Biology May/June 2018 examination, Paper 1 Variant 2.

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