Biology 9700/36 Oct Nov 2011 | Cambridge AS Level Past Papers With Mark Scheme

1. Enzyme-catalyzed sucrose hydrolysis into glucose and fructose using invertase; reducing sugar detection via Benedict’s test with serial dilution of sucrose solutions.

2. Estimation of unknown sucrose concentration by comparison to known concentrations, timing color change for endpoint detection.

3. Modification suggestions for accurate sucrose concentration estimation; controls for validating enzyme activity and experimental precision.

4. Vitamin C content in frozen peas measured at -12°C and -6°C over time; graphical analysis showing nutrient degradation rates under varying storage conditions.

5. Hypothesis testing for complete Vitamin C loss at 10°C storage; data supports faster degradation at higher temperatures.

6. Plan diagrams and detailed drawings of plant stem sections; comparison of trichome structures and vascular tissue adaptations in different plant species.