The Figure shows a plant shoot that has been lit from one side for two days. Figure [Image brief: a young plant shoot growing in a pot of soil. An arrow labelled 'light' points at the shoot horizontally from the left. The upper part of the shoot is curved so that its tip points towards the light. The left side of the shoot is labelled 'lit side' and the right side is labelled 'shaded side'. No other labels.] Which statement explains why the shoot has grown towards the light?
Auxin collects on the shaded side, so cells on that side elongate more.
Auxin collects on the lit side, so cells on that side elongate more.
Auxin is destroyed on the shaded side, so cells on that side elongate less.
Auxin collects on the shaded side, so cells on that side elongate less.
84 exam-style questions on OCR GCSE Biology 3.2 Coordination and control – the endocrine system, covering 3.2.1 Principles of hormonal coordination and control, 3.2.2 Roles of thyroxine and adrenaline, 3.2.3 Hormones in human reproduction, 3.2.4 Interactions of reproductive hormones, 3.2.5 Hormones in contraception, 3.2.6 Hormones in reproductive technologies, 3.2.7 Plant hormones in growth and coordination, 3.2.8 Effects of plant hormones, and 3.2.9 Uses of plant hormones. Each one has a worked solution and a mark scheme showing where the marks go.