Biology 9700/32 May June 2007 | Cambridge AS Level Past Papers With Mark Scheme

1. Estimation of reducing sugar concentration in fruit juice using Benedict's test and serial dilution for comparison with glucose standards.
2. Identification of significant experimental errors in carbohydrate analysis, including volume control and measurement inaccuracies.
3. Investigation of the effect of pH on amylase activity with starch as a substrate, including graphing and interpretation of hydrolysis rates.
4. Hypothesis evaluation on enzyme activity and pH dependence, with discussions on discrepancies between experimental results and predictions.
5. Low-power and high-power plan diagrams of root tip sections, highlighting regions of mitosis and precise cellular measurements using eyepiece graticules and stage micrometers.
6. Comparative analysis of cells from root tip sections with photomicrographs to identify differences in size, structure, and functional specialization.
7. Observation and diagrammatic representation of mitotic stages in root tip cells to illustrate chromosomal behavior during division.