Biology 9700/36 Oct Nov 2019 | Cambridge AS Level Past Papers With Mark Scheme

1. Investigating catalase activity by measuring oxygen production rates across different plant extract concentrations using proportional dilution.

2. Recording oxygen bubble production rates by timing filter paper disc ascent in hydrogen peroxide solution.

3. Errors in catalase assay procedures, including inconsistent disc soaking or timing, and suggested improvements for accuracy.

4. Analyzing oxygen production at varying hydrogen peroxide concentrations; determining mean oxygen volume and plotting reaction rates.

5. Comparing vascular tissue structure in plant stem and root sections through large plan diagrams and xylem vessel analysis.

6. Calculating actual vascular tissue width from eyepiece graticule measurements and documenting structural differences between stem and root tissues.