Biology 9700/53 Oct Nov 2018 | Cambridge AS Level Past Papers With Mark Scheme

1. Use of a potometer to investigate transpiration rates, with variables identified, standardization methods, and procedural setup to assess the effect of light intensity on transpiration.

2. Analysis of transpiration rates under varying CO₂ concentrations at different light intensities, calculation of percentage reductions, and evaluation of experimental conclusions.

3. Antibiotic resistance study in E. coli, utilizing the disc diffusion method, with variables standardized, sensitivity determination methods, and interpretations of prescription data accuracy and standard deviation implications.

4. Correlation analysis of antibiotic use and resistance through Spearman’s rank test, identification of significant antibiotics, and critical value interpretations for data significance.

5. Trends in ampicillin-resistant E. coli infections based on age and gender, with explanations for observed resistance patterns.