Biology 9700/32 Oct Nov 2007 | Cambridge AS Level Past Papers With Mark Scheme

1. Investigation of osmosis in potato strips: changes in length when exposed to different sucrose concentrations, percentage change calculations, and error identification in measurements.

2. Effect of sucrose concentration on water potential: data collection, graphical representation, and determination of isotonic point for precise sucrose concentration.

3. Identification and staining of cartilage tissue: low-power plan diagram and high-power drawing of stained cells, including labeled adjacent cell features.

4. Comparison between stained cartilage tissue and transverse section of the aorta: similarities and differences in material movement functions.

5. Experimental improvements: suggestions to reduce errors such as better temperature control, precise solution preparation, and more frequent concentration intervals for better resolution of isotonic point.