A-LevelBiologyEnergy and respirationMay/June 2022Paper 5 Q211 Marks
Respiration in blowfly larvae, Calliphora erythrocephala, can be studied by determining the respiratory quotient (RQ). A student used the apparatus set up as shown in Fig. 2.1 to measure oxygen uptake by blowfly larvae during respiration. Five replicates were carried out. [Figure 2.1]
📋 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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