- Dilution of stock solutions through both simple dilution and serial dilution (2025, 2022, 2019).
- Microscopy which involves the proper use of the microscope for viewing specimen, calibration of eyepiece graticule (2022), using a stage micrometer, calculation of area of field of view, calculating mean density of specimen, finding the actual width of a specimen, making your own slide (2022-plasmolysis, 2019-banana, 2018-potato).
- Producing biological drawings at low-power and high-power as well as calculating the drawing magnification. (2025-stem of willow tree, 2023-plant stem, 2022-leaf of tea plant, plasmolysis, 2021-plant stem, 2020-leaf, 2019-banana, 2018-leaf, 2017-plant stem, 2016-blood cells)
- Identify significant sources of error, limitations of measurements and/or experimental procedures used and explain how they affect the final result(s). (most years)
- State and explain how significant sources of errors/limitations may be overcome/reduced, as appropriate, including how experimental procedures may be improved. (most years)
- Graph-drawing e.g. best-fit line, best-fit curve, point-to-point graphs, bar graphs and histograms. (most years)
- Factors affecting rate of transport of substances e.g. diffusion and osmosis. (2021, 2019-visking tubing)
- Presence of biological molecules (food tests) e.g. test for reducing sugars (using suitable indicators such as benedict’s solution), test for non-reducing sugars (using acid hydrolysis), test for proteins (using suitable indicators such as biuret solution), test for lipids (using ethanol-emulsion test) and test for starch (using suitable indicators such as iodine). (2025, 2024, 2021, 2019)
- Factors affecting rate of enzyme-catalysed reactions. (2025-invertase, 2024-lipase, 2023-amylase, 2022-catalase, planning, 2020-catalase, 2016-protease)
- Factors affecting rate of respiration. (2025-planning, 2024-planning, 2018)
- Factors affecting the rate of photosynthesis. (not tested in the last 10 years)
- Statistical analysis. (2023-t-test, 2020-t-test)
- Growth rate of plants. (2023-planning)
- Genetics and Inheritance. (2021-planning)
So what topics are most likely to be tested THIS YEAR?
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