Biology 9700/31 Oct Nov 2010 | Cambridge AS Level Past Papers With Mark Scheme

1. Effect of potato surface area-to-volume ratio on catalase activity, measured by oxygen production causing potato pieces to rise in hydrogen peroxide.

2. Influence of pH on catalase activity using water displacement for oxygen measurement; anomalous values identified and graphed for trend analysis.

3. High-power drawing of alveoli in mammalian lungs, emphasizing structural adaptations for gas exchange, and labeling regions for oxygen diffusion.

4. Plan diagram of bronchiole in mammalian lung transverse section; labeled lumen and comparison with blood vessel structure.

5. Calculation of the ratio between bronchiole outer layer thickness and blood vessel wall thickness, including graphical representation of measurements.

6. Structural differences between bronchioles and blood vessels in mammalian lungs observed through photomicrograph analysis.