Aim for 50 minutes per question. If a microscope slide is giving you trouble, move to the calculation/theory part of the question.
Join points with straight lines (ruled) unless a "best-fit" line is specifically requested. Circle outliers if they are clearly anomalous. ⚠️ Identifying Variables and Errors You will be asked to critique your experiment. Be specific. biology 9700 practical notes
Contamination is the number one cause of "weird" results. Check your units: Are you measuring in cm3c m cubed mm3m m cubed ? Converting correctly is vital. Aim for 50 minutes per question
How you record your findings is just as important as the experiment itself. 📝 Tables Draw your table you start the experiment. The independent variable goes in the left column . Include headings with units (e.g., ). Do not put units in the body cells. Ensure all readings have the same number of decimal places. 📊 Graphs Circle outliers if they are clearly anomalous
The microscope is a staple of the 9700 syllabus. You must be comfortable with both low and high-power lenses. Always remember the formula: Plan Diagrams: Do not draw individual cells. Use clear, sharp, continuous lines.
Add Biuret reagent. Positive result: Blue → Purple/Violet.
Heat with Benedict's solution. Color change: Blue → Green → Yellow → Orange → Brick red precipitate. Non-Reducing Sugars: Heat with HCl first, neutralize with NaHCO3cap N a cap H cap C cap O sub 3 , then perform the Benedict's test.