Biology 9700/53 May June 2019 | Cambridge AS Level Past Papers With Mark Scheme

1. Investigating reaction time differences between boys and girls using a computer-based test, focusing on independent and dependent variables.

2. Hypothesis testing for hand dominance in reaction time via t-test analysis and determining statistical significance.

3. Assessing the effect of feedback on task accuracy by analyzing measured line lengths before and after feedback.

4. Standardizing variables in centrifugation for semen sexing, minimizing damage to sperm at high speeds, and comparing methods like flow cytometry.

5. Estimating sperm count per cm³ using a haemocytometer and analyzing sperm motility and morphology for quality control.