Biology 9700/33 Oct Nov 2012 | Cambridge AS Level Past Papers With Mark Scheme

1. Enzyme-catalyzed sucrose hydrolysis in seeds to produce reducing sugars, estimation of sugar concentration using Benedict’s test, and serial dilution preparation of standard solutions.

2. Controlled variable during seed selection, optimal water bath temperature for Benedict’s test, and observation of color change timing to determine enzyme activity.

3. Investigation modification to study temperature effects on enzyme release, linking pH changes to enzyme activity in rubber tree leaves and bark.

4. Plan diagrams of plant root transverse sections, detailed cellular structure drawings, and calibration of eyepiece graticule units using a stage micrometer.

5. Comparison of plant vascular and other tissues between different species, highlighting observable structural differences in photomicrographs.