Bananas are picked while they are unripe. They are transported long distances in cool containers that are ventilated. When the bananas arrive, they are exposed to ethene gas.
Explain why the bananas are picked unripe and are only exposed to ethene at the end of the journey.
Ripening bananas release ethene.
Suggest why the containers are ventilated.
A farmer sprays a field of wheat with a selective weedkiller. The weedkiller contains a synthetic auxin. The weeds in the field have broad leaves. Wheat has narrow leaves.
Explain how the selective weedkiller kills the weeds but not the wheat.
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.