A-LevelBiologyCell structureFeb/Mar 2018Paper 1 Q21 Mark
A student was asked to use the scale bar shown to calculate the magnification of a cell on a photomicrograph. [Figure showing a scale bar: 2 μm] Which method could the student use to calculate the magnification of the cell?
Adivide the diameter of the cell by the length of the scale bar, both measured in the same units of length
Bmeasure the diameter of the cell in millimetres, multiply by 2000 and divide by the length of the scale bar measured in millimetres
Cmeasure the length of the scale bar in millimetres, convert to micrometres and divide by 2
Dmeasure the length of the scale bar in millimetres, convert to micrometres and multiply by 2
✓ 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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