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5.4 Plant hormones

5.4 Plant hormones

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Question 3
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A student investigates the effect of light direction on the phototropic response of plant shoots. They set up three petri dishes containing seedlings on damp paper towels:

  • Dish 1: Placed near a window receiving light from one side (unilateral light). This dish contains 15 seedlings and is kept on a warm windowsill.
  • Dish 2: Placed inside a dark cupboard. This dish contains 5 seedlings and is kept at room temperature.
  • Dish 3: Placed under an overhead lamp providing uniform light from all directions. This dish contains 15 seedlings and is placed on a cold bench next to a drafty window.

Which two of the following improvements should the student make to ensure a valid comparison of the effect of light direction?

  • A: Use the same number of seedlings in each petri dish.
  • B: Add nutrient solution only to Dish 2 to help them grow in the dark.
  • C: Ensure all three petri dishes are kept at the same constant temperature.
  • D: Use a different species of plant in each dish to test generalizability.
  • E: Give more water to Dish 1 because it is in a warmer place.
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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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