Biology 9700/51 May June 2020 | Cambridge AS Level Past Papers With Mark Scheme
1. Methods for immobilising Chlorella cells for experimentation.
2. Identification of independent and dependent variables in the respirometer experiment with Chlorella.
3. Suitability of temperature range (10°C to 50°C) in studying oxygen uptake trends in Chlorella.
4. Field study design validating Bt cotton's effect on reducing H. armigera infestation.
5. Analysis of trends in egg and larva densities across Bt and non-Bt cotton from 1998 to 2007.
6. Long-term impact of Bt cotton on H. armigera population densities in alternative crops.

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