A-LevelBiologyTransport in mammalsOct/Nov 2010Paper 1 Q311 Mark
Some babies are born with a hole between the right and left atria. These newly born babies are found to have an increased number of red blood cells. What is the reason for this increase?
AMore blood is needed because it is pumped faster.
BNewly born babies' haemoglobin has a higher affinity for oxygen.
CNewly born babies' haemoglobin molecules only have one haem group.
DThere is less oxygen available to the newly born baby.
✓ Correct Answer
The correct answer is D: There is less oxygen available to the newly born baby.
📋 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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