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Edexcel International A Level Biology core practicals

The core practicals you can be asked about in the exam, each with its method, variables, safety points and expected results. Practical skills are examined in two written papers, Unit 3 and Unit 6 (each 10% of the International A Level), based on the 18 core practicals.

1Benedict’s reagent and iodine solutionMolecules, Transport and Health · Water, carbohydrates and lipids · spec 1.3 Read

2Structure of the mammalian heartMolecules, Transport and Health · The heart, blood vessels and haemoglobin · spec 1.8 Read

3vitamin C content of food and drinkMolecules, Transport and Health · Cardiovascular disease and its causes · spec 1.14 Read

4membrane permeability, alcohol and temperatureMembranes, Proteins, DNA and Gene Expression · Gas exchange, membranes and transport · spec 2.3 Read

5Osmosis and water potentialMembranes, Proteins, DNA and Gene Expression · Gas exchange, membranes and transport · spec 2.4 Read

6Amino acids, peptide bonds and polypeptidesMembranes, Proteins, DNA and Gene Expression · Proteins and enzymes · spec 2.6 Read

7the initial rate of enzyme-catalysed reactionsMembranes, Proteins, DNA and Gene Expression · Proteins and enzymes · spec 2.8 Read

8observing, drawing and measuring cellsCell Structure, Reproduction and Development · Microscopy and measuring cells · spec 3.8 Read

9root tip squashCell Structure, Reproduction and Development · Mitosis and the cell cycle · spec 3.15 Read

10plant tissues under the light microscopePlant Structure and Function, Biodiversity and Conservation · Plant tissues, fibres and mineral nutrition · spec 4.6 Read

11tensile strength of plant fibresPlant Structure and Function, Biodiversity and Conservation · Plant tissues, fibres and mineral nutrition · spec 4.9 Read

12antimicrobial properties of plants and aseptic techniquePlant Structure and Function, Biodiversity and Conservation · Bacterial growth, plant medicines and drug testing · spec 4.12 Read

13factors affecting the rate of photosynthesisEnergy Flow, Ecosystems and the Environment · Photosynthesis · spec 5.8 Read

14a study of the ecology of a habitatEnergy Flow, Ecosystems and the Environment · Productivity and ecosystems · spec 5.14 Read

15temperature and the development of organismsEnergy Flow, Ecosystems and the Environment · Temperature, evolution and speciation · spec 5.22 Read

16rate of growth in liquid cultureMicrobiology, Immunity and Forensics · Culturing and measuring microorganisms · spec 6.4 Read

17effect of antibiotics on bacteriaMicrobiology, Immunity and Forensics · Antibiotics and infection control · spec 6.14 Read

18redox indicator and yeastRespiration, Muscles and the Internal Environment · Respiratory quotient and respiration practicals · spec 7.7 Read

19respirometer and RQRespiration, Muscles and the Internal Environment · Respiratory quotient and respiration practicals · spec 7.8 Read

20exercise and spirometer tracesRespiration, Muscles and the Internal Environment · The heart, ventilation and exercise · spec 7.15 Read

21HabituationCoordination, Response and Gene Technology · Impulses, synapses and receptors · spec 8.9 Read

22amylase in germinating cereal grainsCoordination, Response and Gene Technology · Plant responses · spec 8.12 Read