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This comprehensive guide provides the essential notes, techniques, and exam strategies you need to master the Cambridge Biology (9700) practical papers.
Making a dilution from a stock solution (e.g., 10cm310 c m cubed solution + 10cm310 c m cubed water to get solution). Serial Dilution: Diluting a sample by a set factor (e.g., x) at each step to create a concentration gradient (e.g., 3. Microscopy and Drawing Techniques
. If a reading involves two measurements (like a temperature change), double the uncertainty ( biology 9700 practical notes
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| Skill Area | What It Assesses | Approx. Marks in Paper 3 | | :--- | :--- | :--- | | | Your ability to handle equipment, take accurate measurements, and record precise observations. | 16 | | Presentation of Data & Observations | Your skill in creating clear results tables, graphs, and biological drawings. | 12 | | Analysis, Conclusions & Evaluation | Your ability to interpret results, draw valid conclusions, and identify errors. | 12 | | Planning | (Mainly in Paper 5) Your ability to design a valid experiment, identifying and controlling variables. | N/A |
Select a scale where the plotted data points occupy more than 50% of the grid area. Avoid awkward scales like blocks of 3 or 7. To help you prepare effectively for your upcoming
: The one you change (e.g., enzyme concentration). Decide on at least 5 different values (range and interval).
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Parallax error when reading volumes. Fix: Ensure eyes are level with the bottom of the meniscus. 4. High-Yield Exam Day Tips Microscopy and Drawing Techniques
Always state that a blank (e.g., distilled water) must be used to set zero absorbance before taking measurements.
: Use a ruler for label lines; lines must touch the feature being labeled and should not have arrowheads. 4. Data Presentation and Analysis
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.
: If the Benedict's test is negative, boil a fresh sample with dilute cap H cap C l
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