A researcher placed a dish containing newly germinated mustard seedlings on its side. The seedlings were kept in the dark so that light did not affect their growth.
After 48 hours, the directions of growth were recorded.
| Part of seedling | Direction of growth |
|---|---|
| Root | Downwards, towards gravity |
| Shoot | Upwards, away from gravity |
State the name of the growth response shown by the root.
Explain why the root and shoot grew in opposite directions.
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.