Ensure the relative sizes of tissues match what is seen under the lens. Do not draw what you think it should look like from a textbook.
Drawings must be done with a sharp HB pencil using clear, continuous lines. Do not shade or stipple. Labels must be horizontal, drawn with a ruler, and must not have arrowheads. Plan Diagrams:
Calculate percentage change in mass. Plot percentage change (y-axis) against solute concentration (x-axis). The point where the line of best fit crosses the x-axis (0% change in mass) represents the internal water potential of the plant tissue. 4. Microscopy, Drawings, and Calibration biology 9700 practical notes
You will be asked to critique your experimental procedures. You must distinguish between human mistakes, systematic errors, and random limitations. Identified Limitation Consequence Practical Improvement Inconsistent volumes of indicators/reagents added.
"Use a colorimeter to get quantitative data" or "Use a color standard for comparison." Common Error: "Heat was lost to the environment." Ensure the relative sizes of tissues match what
Connect points with straight lines using a ruler if the intermediate values are unknown, or draw a smooth, balanced line of best fit if a clear underlying continuous trend exists. Never extrapolate the line beyond your first or last plotted data points. 6. Identifying Errors and Suggesting Improvements
The Biology 9700 practical notes provide a comprehensive guide to the practical component of the Cambridge International A-Level Biology examination. By mastering key concepts, techniques, and tips for success, students can build confidence and proficiency in practical biology and achieve success in their exams. Regular practice, attention to detail, and a thorough understanding of laboratory safety procedures and equipment are essential for success in the practical component. Do not shade or stipple
Doing this immediately gets you into the highest mark band.