Biology 9700/53 May June 2016 | Cambridge AS Level Past Papers With Mark Scheme

1. Systematic sampling to study plant distribution and abundance relative to pond distance, using Spearman’s rank correlation to assess relationships with soil water content.

2. Analysis of soil air content and its correlation with plant species diversity, including statistical validation and limitations of causality conclusions.

3. Experimental control in nicotine addiction research using rats, with dopamine secretion analyzed across treatment groups to evaluate topiramate's efficacy.

4. Topiramate’s impact on dopamine, noradrenaline, and serotonin secretion, showing its potential to reduce nicotine addiction through dopamine inhibition and serotonin stimulation.