Biology 9700,31 Oct Nov 2024 | Cambridge AS - A Level Past Papers With Mark Scheme

1. Enzyme Activity & Starch Detection | Serial dilution of starch-milk solution, iodine test for starch concentration, determining starch contamination in milk, and evaluating errors in experimental steps.

2. Quantitative & Qualitative Analysis | Using a color scale to estimate starch concentration, comparison with standards, and alternative methods for glucose detection in milk.

3. Enzyme Kinetics & Graph Analysis | Investigating lactose breakdown by β-galactosidase, plotting enzyme activity against lactose concentration, and explaining substrate saturation effects.

4. Microscopy & Plant Anatomy | Drawing a plan diagram of a transverse leaf section, labeling lower epidermis, and identifying structural differences between leaf samples.

5. Xylem Structure & Water Transport | Drawing and labeling xylem vessel elements, understanding adaptations for water conduction, and comparing xylem tissue in different species.

6. Micrometer Calibration & Measurement | Calibrating an eyepiece graticule using a stage micrometer, calculating leaf section width, and applying measurement techniques in microscopy.