Biology 9700/53 May June 2020 | Cambridge AS Level Past Papers With Mark Scheme

1. Predicting the respiratory quotient (RQ) for germinating pea seeds based on primary biological molecules (carbohydrates, proteins, fats) and evaluating their aerobic respiration.

2. Designing and explaining the step-by-step use of a respirometer to measure RQ in germinating pea seeds, including precise procedural details.

3. Processing and analyzing experimental results to calculate RQ, identifying trends, and justifying outlier exclusion in data analysis.

4. Examining the effectiveness and environmental impact of Bt cotton varieties, analyzing trends in pesticide use, and explaining resistance development in bollworm species.

5. Investigating the role of Vip3AcAa toxin in enhancing resistance to bollworms through experimental design, control setup, and evaluation of statistical significance.

6. Proposing further experiments to determine the comparative effectiveness of Bt cry1Ac and Bt cry1Ac + vip3AcAa cotton against pink bollworm.