Biology 9700,53 Oct Nov 2024 | Cambridge AS - A Level Past Papers With Mark Scheme

1. Chromatography and Photosynthetic Pigments | Calculation of Rf values, identification of pigment differences between algae species, and analysis of pigment absorption spectra.

2. Photosynthesis and Light Wavelengths | Prediction of photosynthesis rates under different light conditions, using absorption spectra to compare species responses.

3. Experimental Design and Methodology | Use of algal beads to improve validity, identification of independent and dependent variables, and formulation of a step-by-step experimental procedure.

4. Statistical Analysis and Data Interpretation | Use of a t-test for comparing species responses, formulation of null hypotheses, and evaluation of experimental reliability.

5. Biodiversity Indices and Ecosystem Comparisons | Calculation and interpretation of Simpson’s and Shannon diversity indices, discussing differences in biodiversity assessments.

6. Sampling Techniques and Population Studies | Improvement of ecological sampling methods, quadrat use, and analysis of invertebrate population diversity using mathematical models.