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5.4 Plant hormones

5.4 Plant hormones

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Question 5

A horticulturalist investigated the effect of different concentrations of indole-3-butyric acid (IBA), a synthetic auxin, on the root development of lavender stem cuttings.

The concentrations of IBA used for the five treatment groups were:

  • Group A: 0 ppm0\text{ ppm}0 ppm
  • Group B: 0.05 ppm0.05\text{ ppm}0.05 ppm
  • Group C: 1.5 ppm1.5\text{ ppm}1.5 ppm
  • Group D: 30.0 ppm30.0\text{ ppm}30.0 ppm
  • Group E: 600.0 ppm600.0\text{ ppm}600.0 ppm
a.

Group A is a control treatment containing 0 ppm0\text{ ppm}0 ppm of IBA. Explain the purpose of including Group A in this investigation.

[1]
b.

Calculate how many times more concentrated the IBA is in Group E than in Group B. Show your working.

[2]
Markscheme

5.4 Plant hormones Questions

  1. GCSE
  2. /Biology
  3. /5.4 Plant hormones

59 exam-style questions on AQA GCSE Biology 5.4 Plant hormones, covering 5.4.1 Control and coordination and 5.4.2 Use of plant hormones (HT only). Each one has a worked solution and a mark scheme showing where the marks go.

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