Biology 9700/31 Oct Nov 2018 | Cambridge AS Level Past Papers With Mark Scheme

1. Investigation of yeast cell sedimentation, including pH effects on sedimentation rates, accurate sediment measurement using graph paper, and analysis of buffer solution properties.

2. Data plotting and interpolation from yeast cell sedimentation experiments, with graphical determination of yeast cell numbers at specific times.

3. Plan diagrams and cellular structure analysis of plant stem transverse sections, with emphasis on tissue proportions and xylem identification.

4. Calculation of vascular bundle length using photomicrograph magnification, methods for eyepiece graticule scale utilization, and comparative observation of plant stem structures.

5. Observations of cellular and tissue differences between stems of different plant specimens, with systematic recording of structural variations.