A scientist placed a young bean shoot so that light reached it from the right-hand side. After two hours, the scientist measured the amount of auxin in the growing region on each side of the shoot.
| Side of shoot | Position relative to the light | Amount of auxin in arbitrary units |
|---|---|---|
| Right | facing the light | 18 |
| Left | away from the light | 32 |
Calculate the total amount of auxin measured across both sides of the shoot.
State which side of the shoot has the greater amount of auxin.
Give the direction in which the shoot is expected to curve as it grows.
Explain how the difference in auxin concentration causes this curvature.
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.