A-LevelBiologyCell structureFeb/Mar 2024Paper 1 Q11 Mark
A student used a light microscope to observe a blood smear on a microscope slide. An eyepiece graticule was used to measure the diameter of a white blood cell on the slide. The student recorded that the white blood cell was 5 eyepiece graticule units in diameter. Which additional information does the student need to determine the diameter of the white blood cell in micrometres?
Acalibration of the eyepiece graticule using a stage micrometer only
Bcalibration of the eyepiece graticule using a stage micrometer and the magnification of the eyepiece lens
Cthe magnification of the eyepiece lens only
Dthe magnification of the eyepiece lens and the magnification of the objective lens
✓ Correct Answer
The correct answer is A. 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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