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5.4 Plant hormones

5.4 Plant hormones

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Question 18

A student investigated the effect of unilateral light on the growth of young oat coleoptiles (shoots). They set up two experiments in a temperature-controlled room:

  • Experiment A: Coleoptiles were placed in a dark box with a single, unilateral light source coming from the right-hand side.
  • Experiment B: Coleoptiles were placed in an identical dark box with a unilateral light source from the right-hand side, but they were positioned on a slowly rotating platform, distributing the light exposure equally on all sides over time.
a.

State the biological term for a growth response of a plant where the direction of response is determined by the direction of the stimulus.

[1]
b.

What is the role of Experiment B in this investigation?

[1]
c.

Predict the appearance of the shoots in Experiment A and Experiment B after 72 hours.

[2]
d.

Give one environmental variable (other than light) that must be kept constant between both experiments.

[1]
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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