The Biology 9700 Paper 3 (Practical) assessment focuses on your ability to manipulate apparatus, make accurate observations, and present data effectively
. These notes cover the core skills and experimental procedures required for the syllabus. 1. Biological Molecule Tests
You must be able to identify unknown substances using specific reagents. A-Level Notes Reducing Sugars
: Add equal volumes of sample and Benedict's solution; heat in a 95 raised to the composed with power C
water bath. Observe color change from blue to green, yellow, orange, or brick-red. Non-Reducing Sugars
: If the Benedict's test is negative, boil a fresh sample with dilute cap H cap C l biology 9700 practical notes
to hydrolyze it, neutralize with sodium hydrogencarbonate, and repeat the Benedict's test.
: Add a few drops of iodine solution. A color change from brown/orange to blue-black indicates starch. Lipids (Emulsion Test)
: Shake the sample with ethanol, then pour it into a tube of water. A milky white emulsion confirms lipids. Proteins (Biuret Test) : Add Biuret reagent (or cap K cap O cap H followed by cap C u cap S cap O sub 4
). A color change from blue to purple/lilac indicates protein. A-Level Notes 2. Laboratory Techniques : Used to create a range of concentrations. Simple Dilution
: Mix a specific volume of stock solution with a specific volume of solvent (e.g., water to get an concentration). Serial Dilution : Use a constant dilution factor (e.g., The Biology 9700 Paper 3 (Practical) assessment focuses
) by transferring a set volume from one tube to the next in a sequence. Microscopy Calibration
: 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
Drawings are assessed on technical accuracy, not artistic skill. Plan Diagrams : Draw only the tissue layers (outlines). draw individual cells in a plan diagram. High-Power Drawings
: Focus on 3–4 representative cells. Use clear, continuous lines and do not use shading or "fuzzy" sketching.
: Use a ruler for label lines; lines must touch the feature being labeled and should not have arrowheads. 4. Data Presentation and Analysis Exemplar Annotation Notes
AS Level Biology Practical Notes | PDF | Experiment - Scribd
ZNOTES. * UPDATED TO 2019-21 SYLLABUS. CAIE AS LEVEL. BIOLOGY (9700) ... * Convert the measurement from millimeter to. micrometer.
Biology (9700) AS Level Practical Notes for 2019-21 Syllabus
You don't need a lab for this paper; you need common sense and specific vocabulary.
You need to know when to use which test.
