Biology 9700/51 Oct Nov 2012 | Cambridge AS Level Past Papers With Mark Scheme

1. Effect of nitrate concentration on growth rates of freshwater plants through controlled experimental design.
2. Preparation of dilutions for sodium nitrate solutions and use of sterile techniques to minimize contamination.
3. Analysis of standard deviation trends to evaluate variability in growth data over time.
4. Graphical prediction of phosphate effects on plant growth as an additional nutrient study.
5. Efficiency comparison of batch and perfusion systems for culturing rat tumor cells, including statistical t-test applications.
6. Nutrient and waste management effects on cell growth and survival in different culture systems.