Biology 9700/32 Oct Nov 2009 | Cambridge AS Level Past Papers With Mark Scheme

1. Starch and glucose levels in digestion: testing mouth, stomach, and small intestine samples using iodine and Benedict’s solution, with quantitative methods suggested for glucose concentration.

2. Amylase activity: analysis of hydrolysis rates under varying starch concentrations, gradient calculation, and graphical representation for enzyme kinetics.

3. Transverse section analysis of mammalian tubular organs: detailed plan diagrams, guard cell structure observation in high-power magnification, and micrometric calculations of actual cell size.

4. Plant material microscopy: comparison of iodine-stained potato cells and leaf cells for starch storage visualization, including observational explanations.

5. Effectiveness of enzyme concentration in hydrolyzing substrates and assessing enzyme performance under controlled experimental conditions.