A researcher placed young oat shoots vertically in a chamber. For the first 8 hours, light entered the chamber from the left side only.
The table shows the mean increase in length of the growth zone on each side of the shoots.
| Side of shoot | Light received during the first 8 hours | Mean increase in length in 8 hours in mm |
|---|---|---|
| Left | Lit | 3.2 |
| Right | Shaded | 7.6 |
After 8 hours, the light source was moved so that light entered the chamber from the right side only.
Explain the difference between the results for the two sides during the first 8 hours, the initial direction in which the shoots bend, and how the shoots would respond after the light source was moved.
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.