A pot containing a young plant falls onto its side inside a growth cabinet, so the shoot is horizontal. No light enters the cabinet.
After 18 hours, the increase in length of each side of the growing region of the shoot is measured.
| Side of the shoot | Increase in length / mm |
|---|---|
| Upper side | 2.8 |
| Lower side | 6.1 |
Which conclusion about the response of the shoot is correct?
the shoot curved upwards, away from gravity, showing negative gravitropism
the shoot curved upwards, away from gravity, showing positive gravitropism
the shoot curved downwards, towards gravity, showing positive gravitropism
the shoot curved downwards, towards gravity, showing negative gravitropism
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.