Biology 9700/35 Oct Nov 2015 | Cambridge AS Level Past Papers With Mark Scheme

1. Preparation of red cabbage pH indicator solution, investigation of pH effects on color, and identification of unknown solution pH values.

2. Impact of temperature on beetroot cell membrane permeability using colorimetry and the role of alcohol in altering membrane integrity.

3. Comparative structural analysis of plant stems through plan diagrams, with annotations of cellular differences between pith and epidermis.

4. Measurement of leaf thickness in sunlight vs. shade-grown plants, calculation of ratios, and observation of morphological differences.

5. Quantitative assessment of beetroot pigment leakage at varying temperatures, correlation of absorbance to membrane permeability.