Biology 9700/32 May June 2009 | Cambridge AS Level Past Papers With Mark Scheme

1. Yeast activity experiment: investigation of salt concentration effects on glucose breakdown, preparation of salt solutions, and measurement of carbon dioxide production using a syringe and nozzle setup.

2. Data analysis: graph plotting for yeast absorbance, interpolation to calculate yeast growth mass, and hypothesis evaluation on yeast growth trends over time.

3. High-power microscopy: detailed drawings of plant epidermal and underlying cells, stomatal density calculation, and comparative analysis of leaf surfaces for structural adaptations.

4. Measurement techniques: calibration using stage micrometer, field of view area calculation for microscopy, and uncertainties in measurement tools like rulers.

5. Plant anatomy: low-power plan diagrams of vascular bundles, annotation of tissue types, and structural features contributing to plant organ function.

6. Stomatal adaptations: differences in stomatal distribution between leaf samples and their functional roles in gas exchange and water loss regulation.