A-LevelBiologyCell structureOct/Nov 2021Paper 1 Q21 Mark
The eyepiece of a microscope is fitted with an eyepiece graticule and a stage micrometer scale is placed on the microscope. Which statements about the stage micrometer scale are correct? 1 The scale can be used to measure the actual length of cells directly. 2 The scale allows you to calibrate the eyepiece graticule. 3 Less of the scale is visible as the objective lens changes from ×10 to ×40.
A1, 2 and 3
B2 and 3 only
C1 only
D2 only
✓ Correct Answer
The correct answer is B: 2 and 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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