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5.4 Plant hormones

5.4 Plant hormones

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Question 19

A student investigated the effect of gravity on the growth of young maize roots (radicles).

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

  • Apparatus X was kept stationary.
  • Apparatus Y was attached to a slowly rotating clinostat.

Both setups were kept in a dark cupboard at a constant temperature of 22∘C22^\circ\text{C}22∘C for 48 hours.

a.

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

[1]
b.

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

[1]
c.

Describe how the physical appearance of the radicles in Apparatus X will differ from those in Apparatus Y after 48 hours.

[2]
d.

Explain how the hormone auxin causes the response observed in the radicles of Apparatus X.

[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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