A-LevelBiologyBiological moleculesMay/June 2022Paper 1 Q61 Mark
Four extracts from different plant materials were made and tested with Benedict's solution. The extracts were boiled with Benedict's solution for 240 seconds and the final colour was recorded. extract colour produced after 240 seconds 1 red 2 yellow 3 blue 4 green Which sequence of plant extracts represents an increasing quantity of reducing sugar?
A1→2→4→3
B3→1→2→4
C3→2→1→4
D3→4→2→1
✓ Correct Answer
The correct answer is D: 3→4→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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