Biology 9700/31 Oct Nov 2022 | Cambridge AS Level Past Papers With Mark Scheme

- Investigation of ascorbic acid (vitamin C) diffusion across partially permeable membrane (dialysis tubing).
- Preparation of ascorbic acid solutions with varying concentrations for experimental analysis.
- Measurement of iodine solution volume to determine ascorbic acid presence in solutions.
- Calculation of ascorbic acid concentration in external solution based on experimental results.
- Identification of sources of error in concentration determination and suggestions for methodological improvements.
- Analysis of water content reduction in melon cubes soaked in concentrated sucrose solution over time.