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Edexcel International A Level · Biology

Practical Skills in Biology I(Unit 3) revisionBuild it yourself.

Unit 3 covers 3 topics and 13 subtopics. Pick the ones you keep getting wrong and LOCKIN writes you an original exam-style paper, with a full mark scheme.

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What's in Unit 3

Every topic below can be selected on its own, or combined into one paper.

Molecules, Transport and Health practicals

  • Semi-quantitative Benedict's and iodine tests
  • Vitamin C content of food and drink
  • Membrane permeability: alcohol and temperature
  • Initial rate of enzyme-catalysed reactions

Usually 2–11 marks

Cells, Development and Plant Structure practicals

  • Light microscopy of animal cells and use of a graticule
  • Root tip squash and the stages of mitosis
  • Plan diagrams and identification of plant tissues
  • Tensile strength of plant fibres
  • Antimicrobial properties of plants and aseptic technique

Usually 2–10 marks

Experimental design and analysis

  • Variables, controls and experimental design
  • Accuracy, precision, errors and uncertainty
  • Presenting and interpreting data
  • Statistical testing and significance

Usually 2–11 marks

Other Biology units

Unit 1Unit 2Unit 4Unit 5Unit 6

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