A young sunflower shoot is kept upright. Light reaches the shoot from one side only, either north or south.
A student measures the distance between two marks on the north and south sides of the growing region.
| side of growing region | distance before exposure to light in mm | distance after 8 hours in mm |
|---|---|---|
| north | 12.0 | 17.8 |
| south | 12.0 | 14.1 |
Which conclusion about the direction of the light and the distribution of auxin is correct?
light reached the shoot from the north, and more auxin was present on the south side
light reached the shoot from the north, and more auxin was present on the north side
light reached the shoot from the south, and more auxin was present on the south side
light reached the shoot from the south, and more auxin was present on the north side
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.