A-LevelBiologyInherited changeMay/June 2019Paper 4 Q315 Marks
The cilia of ciliated epithelial cells show variation in length, within an individual and between different individuals. Samples of ciliated epithelial tissue were removed from the airways of healthy people and the mean cilia length for each individual was calculated. The people in the study formed two groups: • people who were exposed to a harmful environmental factor • people who were not exposed to a harmful environmental factor. The results are shown in Fig. 3.1. [Figure 3.1]
📋 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.
🔒
Unlock the Examiner's Analysis
Sign up for free to reveal the full examiner report, trap analysis, and mark scheme breakdown for this question.
Sign Up Free to Unlock →Join thousands of Cambridge students already using Oracle Prep