A horticulturist records observations involving a pea root, a tomato fruit, a barley seed and a lavender cutting. Which observation is a tropism?
The barley seed starts to germinate after treatment with gibberellin.
The lavender cutting produces roots after its cut end is treated with auxin.
The pea root curves away from light entering one side of a transparent container.
The tomato fruit becomes ripe after it is exposed to ethene.
87 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.