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5.4 Plant hormones

5.4 Plant hormones

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Question 4

A student investigated the effect of different concentrations of a plant hormone, gibberellin, on the germination rate of barley seeds.

The concentrations of gibberellin used in six petri dishes were:

  • Dish 1: 0 mg/L0\text{ mg/L}0 mg/L
  • Dish 2: 0.04 mg/L0.04\text{ mg/L}0.04 mg/L
  • Dish 3: 0.4 mg/L0.4\text{ mg/L}0.4 mg/L
  • Dish 4: 4.0 mg/L4.0\text{ mg/L}4.0 mg/L
  • Dish 5: 40.0 mg/L40.0\text{ mg/L}40.0 mg/L
  • Dish 6: 800.0 mg/L800.0\text{ mg/L}800.0 mg/L
a.

Dish 1 is a control containing no gibberellin. Why did the student include Dish 1 in the investigation?

[2]
b.

Calculate how many times more concentrated the gibberellin is in Dish 6 than in Dish 2. 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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