Biology 9700/31 May June 2017 | Cambridge AS Level Past Papers With Mark Scheme

1. Vitamin C concentration estimation: Detailed procedure for preparing serial dilutions of vitamin C solution, using DCPIP to determine vitamin C concentration, and recording results accurately.
2. Experimental setup and error identification: Steps for conducting the vitamin C experiment, identifying potential sources of error such as inaccuracies in measurement or inconsistencies in end-point determination.
3. Data visualization and analysis: Instructions for plotting data on the effect of boiling on vitamin C content in vegetables, calculating percentage loss of vitamin C, and analyzing the impact of cooking on nutrient retention.
4. Microscopic examination of plant tissues: Guidelines for observing and drawing plant stem sections, measuring cell dimensions, and identifying anatomical features related to gas exchange.
5. Magnification calculation and comparative anatomy: Procedure for calculating magnification using scale bars in photomicrographs, and annotating observable differences between different plant stem sections.
6. Practical skills and scientific inquiry: Emphasis on developing accurate experimental techniques, critical analysis of results, and applying scientific principles to understand biological processes and structural differences in plant anatomy.