Biology 9700/35 May June 2013 | Cambridge AS Level Past Papers With Mark Scheme

1. Comparison of glucose concentrations using potassium manganate(VII) color change rate, with serial dilutions of glucose solutions (6%, 8%, 10%, 12%).

2. Standardization of test variables such as solution volumes and endpoint observation to ensure consistency in glucose concentration estimations for unknown samples.

3. Identifying errors in timing glucose reactions, improving confidence by refining endpoint detection and procedural precision.

4. Microscopic measurement of plant vascular bundle thickness using eyepiece graticules, calculating xylem to vascular bundle area ratio.

5. Plan diagrams of plant vascular bundles, large cellular drawings for tissue comparisons, and observable structural differences between plant stem sections.

6. Investigation of glucose uptake by plant tissues, graphical representation of glucose concentration changes, and analysis of tissue-specific uptake mechanisms.