Use a thermostatically controlled water bath instead of a manual beaker-and-burner setup.
Draw a small number of cells (usually 2–3) to show detailed cellular structure. Use single, clean lines with no shading or sketching.
Mastering the Cambridge International AS & A Level Biology (9700) practical paper requires a clear understanding of experimental design, data collection, and analysis. Practical assessment contributes significantly to your overall grade through Paper 3 (Advanced Practical Skills). This comprehensive guide compiles essential notes, core techniques, and common evaluation strategies to help you secure top marks. 1. Core Microscopy and Calibration biology 9700 practical notes
Paper 5 is a written exam lasting 1 hour and 15 minutes. It tests your ability to design a theoretical experiment, evaluate data sets, and draw statistically sound conclusions. 1. How to Write an Experimental Plan (Question 1)
A scale inside the microscope eyepiece. It has arbitrary units (epu) and does not change size when magnification changes. Use a thermostatically controlled water bath instead of
Percentage Error=UncertaintyReading×100Percentage Error equals the fraction with numerator Uncertainty and denominator Reading end-fraction cross 100
Choose a scale where the plotted points occupy more than half of the grid area. Use sensible intervals (e.g., 1s, 2s, 5s, or 10s). Plotting: Use a sharp pencil to make small marks or a dot surrounded by a small circle ⊙circled dot Mastering the Cambridge International AS & A Level
Never write units inside the data cells. Units belong exclusively in the column headers.
Cool and neutralize the acid by adding Sodium Hydrogencarbonate ( NaHCO3NaHCO sub 3 ) until effervescence ceases. Perform the standard Benedict’s test.
Biochemical tests are a staple of Paper 3. You must know how to perform them, identify positive/negative results, and understand the underlying science. Benedict’s Test for Reducing Sugars Glucose, fructose, maltose, galactose.
Paper 3 always asks you to evaluate errors and suggest modifications. You must differentiate between systematic errors and random experimental limitations. Identified Limitation Suggested Practical Improvement Judging color changes subjectively by eye.