A scientist grew a young plant with its root pointing vertically downwards. A gel containing a high concentration of auxin was placed against the right side of the growing region of the root.
After several hours, the root had curved towards the right.
Explain why the root curved towards the right.
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.