Biology 9700/52 Oct Nov 2021 | Cambridge AS Level Past Papers With Mark Scheme

- Yeast respiration comparison: Glucose vs. Maltose, Saccharomyces cerevisiae, fermentation processes.
- Independent variable: Type of sugar (glucose, maltose); dependent variable: Rate of gas production.
- Importance of stirring yeast suspension: Homogeneity, consistent distribution of yeast cells.
- Methodology for testing hypothesis: Yeast culture preparation, sugar addition, gas collection measurement.
- Data analysis: Rate of respiration calculation, volume of gas produced over time, graphical representation.
- pH measurement techniques: pH meter advantages over indicator solutions, accuracy, precision, real-time monitoring.