A plant breeder grows two varieties of pumpkin in heated glasshouses. One variety flowers in winter, but the other variety does not. The breeder needs both varieties to flower at the same time so that pollen can be transferred between them. Plants of the second variety are divided into two groups. One group is sprayed with gibberellin and the other group is sprayed with water. Which observation is most likely?
The gibberellin-treated plants stop growing in winter, while the water-treated plants keep growing
The gibberellin-treated plants begin flowering in winter, before the water-treated plants
The gibberellin-treated plants flower with the water-treated plants but develop more roots
The gibberellin-treated plants flower with the water-treated plants but grow larger leaves
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.