A seed germinates under the surface of the soil. The root grows downwards and the shoot grows upwards.
Give the full name of the response shown by the root, including whether the response is positive or negative.
Give the stimulus for a gravitropism and the stimulus for a phototropism.
Explain one advantage to the seedling of its root growing downwards.
The shoot grows upwards even though there is no light under the soil.
Explain why this is an advantage to the seedling.
105 exam-style questions on Edexcel GCSE Biology 6.3 Plant hormones, covering 6.3.1 Plant hormones and tropisms and 6.3.2 Commercial uses of plant hormones. Each one has a worked solution and a mark scheme showing where the marks go.