The diagram shows a simplified nitrogen cycle. [Figure 38.1] Which row shows the correct labels for P, Q, R and S?
✓ Correct Answer
The correct answer is D: reduction by anaerobic bacteria nitrogen fixation by root nodule bacteria decomposition of organic nitrogen decay of urea by saprotrophic bacteria
📋 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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