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5.4 Plant hormones

5.4 Plant hormones

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Question 14

A student investigated the effect of gravity on the growth of young bean shoots (plumules).

The student pinned several seedlings horizontally to a cork board in two different setups:

  • Apparatus A was kept stationary.
  • Apparatus B was attached to a slowly rotating clinostat.

Both setups were kept in a dark cupboard at a constant temperature of 20∘C20^\circ\text{C}20∘C for 48 hours.

a.

Explain why the student kept both setups in a dark cupboard.

[2]
b.

Explain the purpose of using the rotating clinostat (Apparatus B) in this experiment.

[2]
c.

Describe how the physical appearance of the shoots in Apparatus A will differ from those in Apparatus B after 48 hours.

[2]
d.

Explain how the hormone auxin causes the response observed in the shoots of Apparatus A.

[3]
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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