A-LevelBiologyCell structureMay/June 2010Paper 1 Q131 Mark
The diagram shows a stage micrometer, with divisions 0.1 mm apart, viewed through an eyepiece containing a graticule. [Figure 13.1] What is the area of the field of view of the microscope at this magnification? (π = 3.14)
Aπ × 12.5 × 12.5 = 4.9 × 10² µm²
Bπ × 55 × 55 = 9.5 × 10³ µm²
Cπ × 125 × 125 = 4.9 × 10⁴ µm²
Dπ × 250 × 250 = 2.0 × 10⁵ µm²
✓ Correct Answer
The correct answer is C: π × 125 × 125 = 4.9 × 10⁴ µm²
📋 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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