A-LevelBiologyTransport in mammalsMay/June 2017Paper 1 Q261 Mark
The graph shows pressure changes during a cardiac cycle. [Graph showing pressure/kPa vs. time/s with curves labeled W, X, Y, Z] Which row correctly identifies W, X, Y, and Z? [Table with columns W, X, Y, Z and rows A, B, C, D with valve states]
AW atrioventricular valves close, X semi-lunar valves close, Y semi-lunar valves open, Z atrioventricular valves open
BW atrioventricular valves close, X semi-lunar valves open, Y semi-lunar valves close, Z semi-lunar valves open
CW semi-lunar valves close, X atrioventricular valves open, Y atrioventricular valves close, Z semi-lunar valves open
DW semi-lunar valves open, X atrioventricular valves close, Y atrioventricular valves open, Z semi-lunar valves close
✓ Correct Answer
The correct answer is B. This question tests the candidate's understanding of transport in mammals 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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