Biology 9700,52 Oct Nov 2024 | Cambridge AS - A Level Past Papers With Mark Scheme

1. Photosynthesis & Experimental Design | Investigation of the light-dependent stage using DCPIP, control experiments, data analysis, graph plotting, and effects of temperature.

2. Chloroplast Suspension Preparation | Role of sucrose solution in maintaining chloroplast integrity, effect of distilled water on experimental results.

3. Statistical Analysis & Graph Interpretation | Calculation of reaction rates, plotting and analyzing photosynthetic activity under different conditions.

4. Evolution & Adaptation | Study of phenotypic variation in Adalia bipunctata (two-spot ladybird), seasonal changes in population genetics.

5. Selection Pressures & Environmental Influence | Impact of temperature on melanic vs. non-melanic morphs, advantages of dark pigmentation in thermoregulation.

6. Genetics & Breeding Experiments | Investigation of dominant and recessive alleles in ladybird coloration, experimental validation of heterozygosity in melanic phenotypes.

7. Statistical Testing & Data Interpretation | Selection and justification of appropriate statistical tests to analyze correlation between body mass and temperature changes.