A-LevelBiologyCell structureFeb/Mar 2018Paper 1 Q11 Mark
The eyepiece lens of a microscope can be fitted with an eyepiece graticule. Which of these statements about eyepiece graticules are correct? 1 They measure the actual length of cells in micrometres. 2 They help biologists to draw cells with correct proportions. 3 They change in size when the objective lens is changed from ×10 to ×40.
A1, 2 and 3
B1 and 3 only
C1 only
D2 only
✓ Correct Answer
The correct answer is D: 2 only
📋 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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