Biology 9700,35 Oct Nov 2024 | Cambridge AS - A Level Past Papers With Mark Scheme

1. Enzyme Activity & Temperature Effects | Investigation of amylase activity on starch at different temperatures, Benedict’s test for reducing sugars, iodine test for starch, and quantitative estimation of reducing sugar concentration.

2. Experimental Design & Data Analysis | Identifying independent variables, recording results in tables, interpreting enzyme activity trends, and determining optimal temperature for enzymatic reactions.

3. Graph Plotting & Interpretation | Constructing a graph of enzyme reaction rates at various temperatures, analyzing enzyme kinetics, and identifying temperature effects on protein digestion.

4. Microscopy & Leaf Structure Analysis | Drawing a plan diagram of a stained transverse leaf section, labeling palisade tissue, and comparing structural differences in leaf samples.

5. Cellular & Tissue Structure Comparisons | Observing differences in epidermal and mesophyll cells, analyzing chloroplast distribution, and comparing leaf adaptations under different conditions.

6. Measurement & Calculation in Microscopy | Measuring leaf thickness using calibrated photomicrographs, calculating mean thickness, and applying magnification to determine actual dimensions.