A-LevelBiologyControl and coordinationOct/Nov 2017Paper 4 Q68 Marks
Cloves are the aromatic flower buds of the tree Syzygium aromaticum. Eugenol is a drug extracted from cloves. Eugenol affects the movement of sodium ions through the cell surface membranes of sensory neurones. (a) Fig. 6.1 shows the effect of eugenol concentration on the percentage decrease in sodium ion movement. [Figure 6.1]
📋 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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