A student investigated the effect of light on the growth of newly germinated seedlings.
Dish 1 was lit evenly from above.
Dish 2 was placed in a box with a hole in one side, so light came from one side only.
Dish 3 was kept in complete darkness.
What was the reason for including Dish 1?
To show that light is needed for the seeds in the dishes to germinate
To show how the seedlings grow when the light does not come from one side
To make sure that all of the seedlings receive exactly the same volume of water
To give the seedlings enough light to photosynthesise at the maximum possible rate
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.