A-LevelBiologyBiodiversity and conservationMay/June 2013Paper 1 Q391 Mark
Which statements about energy flow in ecosystems are correct? 1 All energy eventually leaves ecosystems in the form of heat. 2 The average energy transfer between trophic levels is 10%. 3 The energy stored and lost from an ecosystem is equal to the energy input from the Sun.
A1, 2 and 3
B1 and 2 only
C1 and 3 only
D2 and 3 only
✓ Correct Answer
The correct answer is A: 1, 2 and 3
📋 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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