Biology 9700/31 May June 2011 | Cambridge AS Level Past Papers With Mark Scheme

1. Investigation of copper sulfate's inhibitory effects on amylase through serial dilutions and enzymatic activity tests.
2. Use of iodine to detect starch presence, with time intervals indicating reaction progression.
3. Modifications to improve experimental accuracy, including potential colorimeter application and procedural adjustments.
4. Analysis of light absorbance data to study copper sulfate's interaction with protein suspensions, highlighting anomalies and trends.
5. Plan and detailed cell layer diagrams of leaf cross-sections, focusing on xylem, air spaces, and epidermal features.
6. Calculation of magnification in photomicrographs and comparative analysis of structural differences between plant species.