A high-frequency practical involved measuring the rate of oxygen bubble production from liver/celery discs in hydrogen peroxide (H₂O₂), with varying pH or temperature.
Investigate the effect of different sugar concentrations on potato strips. Expected Answers/Data: o level biology practical 2020 answers
4. Crucial Tips for High Marks (2020 Marking Scheme Insights) A high-frequency practical involved measuring the rate of
: When recording a semi-quantitative Benedict's test in a table, students were required to display specific headings and clear trends: Sample Identification Time Taken for Color Change (s) Final Color Observed Estimated Glucose Concentration ( g/dm3g/dm cubed Sample B (Highest Glucose) Shortest time (e.g., 26s) Brick-Red precipitate High (e.g., 0.95) Sample D (Negative Control) >120is greater than 120 Clear Blue solution 26s) Brick-Red precipitate High (e.g.
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