A scientist cut equal-length sections from the growth zones just behind the tips of young shoots and roots.
The sections were placed for 12 hours in either water or an auxin solution.
| Type of section | Mean increase in length in water in mm | Mean increase in length in auxin solution in mm |
|---|---|---|
| Shoot | 1.2 | 4.8 |
| Root | 3.4 | 1.1 |
In a different plant, auxin becomes concentrated on the left side of both an intact shoot and an intact root.
Using the data, explain the direction in which each organ would bend.
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.