A-LevelBiologyCell structureOct/Nov 2019Paper 1 Q11 Mark
A student calibrated the scale on an eyepiece graticule in the eyepiece lens of a light microscope. The student was given a stage micrometer scale to use. The divisions on the stage micrometer scale were 0.1 mm apart. Which data must the student collect in order to calibrate the eyepiece graticule? 1 magnification of the eyepiece lens of the microscope 2 number of divisions of the stage micrometer scale seen in one field of view of the microscope 3 number of divisions of the eyepiece graticule scale equivalent to each division of the stage micrometer scale
A1 and 3
B2 and 3
C2 only
D3 only
✓ Correct Answer
The correct answer is D: 3 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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