Practical Notes _hot_ - Biology 9700

I'll produce a comprehensive, organized document including:

Accuracy in visual representation and data recording is critical for the practical exam.

Magnification=Image SizeActual SizeMagnification equals the fraction with numerator Image Size and denominator Actual Size end-fraction 2. Essential Syllabus Experiments

Used when concentrations need to decrease exponentially (e.g., by a factor of 10 or a factor of 2 each time). This is crucial for determining unknown concentrations via a standard curve or color scale. Example: Making a 2-fold (halving) serial dilution Set up 5 test tubes. Add 10 cm3c m cubed of 10% stock solution to Tube 1. cm3c m cubed of distilled water to Tubes 2, 3, 4, and 5. cm3c m cubed biology 9700 practical notes

Plot the independent variable on the x-axis and the dependent variable on the y-axis. Label both axes clearly with units.

Download the past papers for May/June 2024 and try Question 2 from Paper 33. That serial dilution question appears every single year.

Use words like "rate," "concentration," "volume," and "percentage change" appropriately. Recommended Resources CAIE 9700 Syllabus Document Past Papers (Paper 3 & 5) from PapaCambridge or GCE Guide Microscope simulation tools for practicing calibration. This is crucial for determining unknown concentrations via

Always place the independent variable (the factor you change) in the first column. Place the dependent variable (the factor you measure) in the subsequent columns. Graphing Protocols

Draw a smooth curve or a straight line through the points. If you are unsure of the trend, join the points dot-to-dot with straight, ruled lines. Never extrapolate the line beyond your first or last data point unless explicitly instructed. 6. Identifying Sources of Error and Improvements

You will frequently be asked to dilute a stock solution (e.g., 1.0% glucose) to create a range of concentrations. cm3c m cubed of distilled water to Tubes 2, 3, 4, and 5

Paper 5 is the "dry lab" (written exam). Notes here are arguably more valuable than Paper 3 notes because they teach exam technique.

: Draw only the tissue boundaries; never draw individual cells.

: Use a stage micrometer to find the value of one eyepiece graticule unit ( ) at a specific magnification. Magnification Formula A-Level Notes 3. Biological Drawings