A scientist places porous pads containing auxin solutions K and L against opposite sides of the growing regions of a young root and a young shoot. Solution K is placed on the left side and solution L is placed on the right side.
Relative elongation without added auxin is 100%.
| Organ | Relative elongation with solution K (%) | Relative elongation with solution L (%) |
|---|---|---|
| Root | 55 | 85 |
| Shoot | 175 | 125 |
Explain which solution contains the higher concentration of auxin.
The scientist exchanges the positions of the pads, so solution K is on the right side and solution L is on the left side.
Explain how the root and the shoot will curve.
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.