Biology 9700/31 Oct Nov 2013 | Cambridge AS Level Past Papers With Mark Scheme

1. Investigation of diffusion rate of ascorbic acid into stained agar blocks through simple dilution and timing.
2. Use of serial dilutions to prepare concentrations for experiments, focusing on confidence improvements and error reduction.
3. Counting and estimating red blood cell density using a sampling method and calculating field of view area from photomicrographs.
4. Effects of altitude on red blood cell production and its physiological advantages.
5. Comparative observation and drawing of different types of white blood cells to identify structural differences.
6. Identification of transport-related features in tissue sections to support functional hypotheses.