Biology 9700/05 Oct Nov 2007 | Cambridge AS Level Past Papers With Mark Scheme

1. Immobilization of algae in alginate beads and testing photosynthesis rates under varying light intensities using hydrogen carbonate indicators.
2. Methods to vary light intensity and use pH-sensitive indicators for measuring carbon dioxide concentration changes as the dependent variable.
3. Analysis of coffee's effect on reaction times, identifying dependent and independent variables, and accounting for uncontrolled variables like age, sex, and caffeine tolerance.
4. Statistical significance testing of grazing effects on moth populations using chi-squared analysis, with implications for conservation strategies.
5. Identification and calculation of degrees of freedom and probability in chi-squared results to interpret grazing impact significance.
6. Assessment of experimental reliability and accuracy in measurement techniques, emphasizing control and standardization of variables for consistent results.