A young root is initially vertical and is free to bend as it grows. A block that releases auxin is placed against side X of the growing region. An identical block that does not release auxin is placed against side Y.
The table shows the mean length of cells on each side of the root.
| side of root | mean cell length at start in µm | mean cell length after 4 hours in µm |
|---|---|---|
| X | 42 | 48 |
| Y | 42 | 66 |
Using the information in the table, explain how the auxin affects the root and predict the direction in which the root curves.
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.