(1.0%)×V1=(0.4%)×10 cm3⟹V1=4 cm3 of stockopen paren 1.0 % close paren cross cap V sub 1 equals open paren 0.4 % close paren cross 10 cm cubed ⟹ cap V sub 1 equals 4 cm cubed of stock of distilled water to reach the total volume. Serial Dilution
Draw only what you observe under the microscope in real time.
Align the zero marks of both the eyepiece graticule and the stage micrometer scales. biology 9700 practical notes
Use a colorimeter to get objective, quantitative absorbance readings. Concentration of solutions increases artificially.
Percentage Uncertainty=Instrument UncertaintyValue Measured×100Percentage Uncertainty equals the fraction with numerator Instrument Uncertainty and denominator Value Measured end-fraction cross 100 Use a colorimeter to get objective, quantitative absorbance
This paper tests your ability to manipulate equipment, make observations, and record data.
(Image size / Actual size). Always use the same units (usually 3. Data Presentation & Evaluation (Image size / Actual size)
: Ensure consistent amounts of reagents using a graduated pipette or burette. Dilution Techniques :
Guide to A-Level Biology (9700) Practical Skills Success in the CAIE Biology 9700 practical component (Paper 3) isn't just about knowing facts—it’s about demonstrating precision, following instructions to the letter, and understanding the "why" behind the "how." 1. The Core Skill Sets