A researcher grew radish seedlings with light coming from one side only. After two days, the researcher moved the light to a different side and left the seedlings for two more days.
The table shows the direction in which the shoots and the roots bent during each period.
| Side the light came from | Direction in which the shoots bent | Direction in which the roots bent |
|---|---|---|
| North | North | South |
| East | East | West |
The researcher concluded that both the shoots and the roots show a tropism.
Explain how the results support this conclusion.
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.