Biology 9700/51 May June 2024 | Cambridge AS Level Past Papers With Mark Scheme

1. Investigation of the effect of wind speed on transpiration in Spiraea japonica, focusing on methodical data collection and analysis.

2. Analysis of isohydric vs. anisohydric tree responses under water stress and elevated temperatures, examining stomatal conductance and physiological trade-offs.

3. Evaluation of experimental controls, statistical significance, and null hypotheses to improve the validity of biological studies.

4. Study on the efficacy of various mosquito repellents, analyzing chemical composition and repellency effectiveness in controlled environments.

5. Examination of environmental standardization and the impact of abiotic factors on plant physiological responses.

6. Application of statistical tools like the t-test to evaluate differences in experimental outcomes, emphasizing rigorous data interpretation.