A young bean root is growing vertically downwards in darkness. A gel strip that slowly releases auxin is placed against the left side of its growing region.
Which prediction about the growth of the root over the next few hours is correct?
it curves to the left because cell elongation is inhibited on the side touching the strip
it curves to the right because cell division increases on the side touching the strip
it curves to the right because cell elongation is stimulated on the side touching the strip
it grows straight down more slowly because cell elongation is inhibited on both sides
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.