Scientists cut equal strips of tissue from the growing regions just behind the tips of roots and shoots. Each strip was initially 20.0 mm long.
The scientists placed the strips in solutions containing auxin for 6 hours.
| Auxin concentration in arbitrary units | Final length of root tissue in mm | Final length of shoot tissue in mm |
|---|---|---|
| 2 | 22.4 | 21.8 |
| 6 | 20.8 | 24.5 |
In an intact seedling, the auxin concentration is 2 arbitrary units on the left side and 6 arbitrary units on the right side of both the root and the shoot. Assume that the growth of each side matches the data in the table.
Calculate the difference in the increase in length of the root tissue at the two auxin concentrations.
Explain how the root would bend.
Explain how the shoot 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.