The tip of a young shoot is covered with a small cap that does not let light through.
The shoot is then lit from one side only.
Which statement describes and explains the result?
The shoot grows straight up, because the tip cannot detect the direction of light
The shoot bends towards the light, because the stem below the cap detects the light
The shoot grows straight up, because the tip under the cap can no longer produce auxin
The shoot bends away from the light, because auxin collects on the lit side under the cap
59 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.