O Level Biology Practical 2020 Answers !!top!! Jun 2026

Students were required to design an experiment to investigate the effect of pH on catalase activity using buffer solutions . 2. Cambridge O Level (Syllabus 5090) - Main Experiments

For students seeking additional support and resources, consider the following: o level biology practical 2020 answers

You were likely given a table of results to plot on a graph. Students were required to design an experiment to

| Slice | Initial Colour | 5 min | 10 min | 20 min | pH | |-------|----------------|-------|--------|--------|-----| | A (HCl) | Creamy yellow | Creamy yellow | Creamy yellow | Creamy yellow | 2–3 | | B (Cut up) | Creamy yellow | Very pale brown | Pale brown | Brown | ~6 | | C (Untreated) | Creamy yellow | Creamy yellow | Very pale brown | Pale brown | ~6 | | Slice | Initial Colour | 5 min

The drawing must occupy at least half to two-thirds of the space provided. It must accurately reflect the proportions of the original specimen.