A sunflower seedling grows beneath a shelf. Light reaches the shoot from an open space on the right, and the shoot curves to the right. Which statement about auxin explains why the shoot curves to the right?
Auxin is distributed equally between the left and right sides of the shoot
More auxin is present on the left side of the shoot than on the right side
Auxin is present only in the cells at the tip of the shoot
More auxin is present on the right side of the shoot than on the left side
87 exam-style questions on AQA GCSE Biology 5.4 Plant hormones, covering 5.4.1 Control and coordination and 5.4.2 Use of plant hormones (HT only). Each one has a worked solution and a mark scheme showing where the marks go.