Biology 9700 Practical Notes Fixed Jun 2026

The practical component of the Biology 9700 syllabus accounts for 20% of the total marks. It assesses students' ability to:

[Sample] ---> Add Benedict's Reagent ---> Heat in Water Bath ---> Green/Yellow/Orange/Red (Reducing Sugar) [Sample] ---> Add Iodine Solution ---------------------------> Blue-Black (Starch) [Sample] ---> Add Biuret Reagent ---------------------------> Purple/Violet (Protein)

Students must carry out a biological investigation, collect quantitative or qualitative data, process data into tables or graphs, and draw conclusions based on evidence. Common contexts include enzymes, transport, osmosis, membranes, pigments, or ecology-style sampling.

Draw a small group of adjacent cells (usually 3 to 5 cells) to showcase individual cellular details, cell walls, and nuclei. biology 9700 practical notes

Plot the independent variable on the horizontal x-axis and the dependent variable on the vertical y-axis.

If you are preparing for or Paper 5 (planning & evaluation) Any statistical test or calculation you find confusing

Mastering the Cambridge International AS & A Level Biology (9700) practical paper requires a solid grasp of core experimental techniques, accurate data collection, and precise analytical skills. This comprehensive guide serves as your ultimate revision notebook, breaking down essential laboratory skills, mandatory experiments, data presentation rules, and high-yield exam strategies. 1. Core Laboratory Techniques & Microscopy The practical component of the Biology 9700 syllabus

Choose simple, intuitive scales (e.g., 1, 2, 5, or 10 units per large grid square). The plotted data points must occupy more than 50% of the grid area.

Use a colorimeter to measure absorbance/transmission or use a color chart (e.g., starch disappearance using amylase). Mass Loss: Track mass loss on a digital balance over time. Controlling Variables

Separating pigments (chlorophyll a, chlorophyll b, carotenes, and xanthophylls) from leaves helps evaluate photosynthetic adaptations. Draw a small group of adjacent cells (usually

Use a thermostatically controlled water bath instead of a manual beaker-and-burner setup.

To determine actual cell size, first note the scale bar on the eyepiece graticule, count the divisions the cell spans, and multiply the number of divisions by the size of one division (usually given on the microscope) to obtain the cell’s actual length in μm.