Biology 9700/35 May June 2011 | Cambridge AS Level Past Papers With Mark Scheme

1. Investigation of ethanol concentration effects on plant tissue permeability, including serial dilution and methylene blue retention.
2. Control setup and observation recording techniques to assess ethanol's impact on selective membrane permeability.
3. Graphical representation of pH effects on absorbance values and estimation of unknown pH using interpolation from plotted data.
4. Consistency in experimental variables such as temperature, buffer solution composition, and plant tissue dimensions to ensure reliable results.
5. Comparative analysis of transverse root sections from different plant species using plan diagrams and magnification calculations.
6. Microscopic observation and drawing of banana cells stained with iodine to identify structural features, including cell walls and internal components.