A researcher grows newly germinated mustard seedlings in transparent pouches lined with damp paper, so the roots can be seen without moving the seedlings.
For two days, every pouch has been lit from the left side only by a lamp. The researcher has measured and recorded the angle of each root.
Plan the rest of the investigation to find out how moving the light to the right side affects the direction of root growth.
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.