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5.4 Plant hormones

5.4 Plant hormones

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Question 24

A commercial grower investigated the effect of different concentrations of a plant hormone, auxin, on the success rate of root development in lavender stem cuttings.

The concentrations of auxin used in six groups of cuttings were:

  • Group A: 0 mg/L0\text{ mg/L}0 mg/L
  • Group B: 0.05 mg/L0.05\text{ mg/L}0.05 mg/L
  • Group C: 0.5 mg/L0.5\text{ mg/L}0.5 mg/L
  • Group D: 5.0 mg/L5.0\text{ mg/L}5.0 mg/L
  • Group E: 50.0 mg/L50.0\text{ mg/L}50.0 mg/L
  • Group F: 2250.0 mg/L2250.0\text{ mg/L}2250.0 mg/L
a.

Group A is a control containing no auxin. Explain why the grower included Group A in this investigation.

[1]
b.

Calculate how many times more concentrated the auxin is in Group F 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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