A technician placed newly germinated mustard seedlings in two vertical Petri dishes inside a light-proof cupboard.
One dish remained stationary. The other dish was attached to a clinostat, which rotated slowly.
The rotating dish acted as a control. What comparison did this make possible?
Growth with gravity acting from one direction compared with growth with gravity acting evenly on all sides
Growth with gravity acting at its normal strength compared with growth with gravity acting more strongly
Growth with light coming from one direction compared with growth with light coming from all sides
Growth of the roots towards gravity compared with growth of the shoots away from gravity
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.