An opaque plant pot is kept in darkness. A root grows through an opening in the side of the pot.
Which observation shows positive gravitropism?
The root curves upwards after leaving the opening.
The root curves downwards after leaving the opening.
The root continues to grow horizontally after leaving the opening.
The root grows faster after leaving the opening.
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.