A young pea shoot has been receiving light from its right side. A second lamp is switched on to its left, and both lamps provide the same light intensity.
Which statement describes the response of the shoot to this change in lighting?
Auxin remains in the shoot tip, so growth occurs only at the tip
Auxin moves repeatedly between the two sides, so the shoot bends towards each lamp in turn
Auxin becomes evenly distributed, so the left and right sides of the shoot grow at the same rate
Auxin becomes evenly distributed, so cell elongation is inhibited equally on both sides of the shoot
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.