Biology 9700/05 Oct Nov 2003 | Cambridge AS Level Past Papers With Mark Scheme

1. Respiration experiment: measuring capillary tube liquid movement caused by germinating beans consuming oxygen; soda lime absorbs CO₂.

2. Calculating mean liquid movement and respiratory quotient (RQ); interpreting deviations when soda lime is removed.

3. Kidney section drawings: glomerulus and tubules labeled with surrounding structures; estimating glomerular width using eyepiece graticule and nuclei diameter.

4. Enzyme activity plan for rennin and milk coagulation: temperature variation using water bath, stopwatch, and consistent volumes of rennin and milk.

5. Experiment improvement strategies: replicating measurements, ensuring accurate temperature control, and recording coagulation endpoints.