A-LevelBiologyCell structureOct/Nov 2025Paper 1 Q11 Mark
A student observed some cells using a microscope with an eyepiece graticule. [Figure showing cells and eyepiece graticule scale] They then replaced the slide containing the cells with a stage micrometer with a millimetre scale, and lined up the eyepiece graticule as shown. [Figure showing graticule and stage micrometer scales aligned] What is the maximum diameter of the cell labelled X?
A0.0066 µm
B66 µm
C73 µm
D733 µm
✓ Correct Answer
The correct answer is C. This question tests the candidate's understanding of cell structure within the Biologysyllabus. The examiner's mark scheme requires...
📋 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...
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