Biology 9700/32 May June 2013 | Cambridge AS Level Past Papers With Mark Scheme

1. Investigation of temperature effects on oxygen release from hydrogen peroxide using yeast enzymes as a catalyst.
2. Standardization of experimental variables, including water levels and delivery tube positioning, in measuring oxygen release.
3. Identification of significant errors in experiments and proposed modifications to improve reliability and accuracy.
4. Graphical analysis of the relationship between hydrogen peroxide concentration and oxygen release rate.
5. Comparative analysis of plant stem structures using plan diagrams and differences in cell sizes and tissue organization.
6. Observational study of vascular and supportive tissues in plant stems, emphasizing adaptations for structural support.