Biology 9700/31 May June 2022 | Cambridge AS Level Past Papers With Mark Scheme
CIE
AS & A Level
Biology (9700)
Jun
2022
- Estimation of concentration of molecule R in plant extract U.
- Serial dilution of 10% molecule R solution; preparation of four additional concentrations.
- Reaction of molecule R with acidified potassium manganate(VII) solution; color change from pink to colorless.
- Measurement of drops needed to reach end-point; recording results in a table.
- Investigation of plant extracts; correlation between time to end-point and concentration of molecule R.
- Analysis of inhibition area of bacteria by different concentrations of plant extract; potential antibiotic properties.
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Laura Bellini 
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