Biology 9700/51 May June 2023 | Cambridge AS Level Past Papers With Mark Scheme

1. Investigation of catalase activity along the length of a carrot root using hydrogen peroxide breakdown, measuring reaction rates by filter paper disc rise time.

2. Experimental setup for enzyme activity evaluation, emphasizing variables such as temperature, hydrogen peroxide concentration, and catalase extraction methods.

3. Analysis of the effect of fish farming on wild sea trout infections by salmon lice, using electrofishing and statistical comparisons between fish farm proximity and infection rates.

4. Laboratory method for determining lethal levels of salmon lice on sea trout, including control experiments to isolate cause-effect relationships.

5. Statistical interpretation using data like percentage infection and 95% confidence intervals to evaluate fish farm impact on wild fish populations.

6. Evaluation of environmental and experimental factors affecting enzyme kinetics and ecological data collection reliability.