Biology 9700/34 May June 2014 | Cambridge AS Level Past Papers With Mark Scheme

1. Investigating the diffusion of ascorbic acid from plant extract using Visking tubing as a selectively permeable membrane.
2. Measuring ascorbic acid concentration in water samples by titration with iodine solution.
3. Effects of ascorbic acid on the reliability of iodine as a starch test in plant tissues.
4. Identification and drawing of alveoli to examine structures specialized for gas exchange in mammals.
5. Observing leaf adaptations to minimize transpiration, including specialized cellular features.
6. Calculation of magnification from photomicrographs using scale bars for precise measurements.