A sunflower seedling is growing straight in a chamber lit evenly from above. The overhead light is then blocked, and light reaches the growing shoot only through an opening in the east wall of the chamber. The shoot tip is undamaged.
Which change is expected on the west side compared with the east side?
higher auxin concentration and faster cell elongation
lower auxin concentration and faster cell elongation
higher auxin concentration and slower cell elongation
lower auxin concentration and slower cell elongation
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.