What you’ll learn5 learning objectivesChoose one objective for a focused lesson, or study the complete topic.14.5.1Gravitropism as a response in which• Describe gravitropism as a response in which parts of a plant grow towards or away from gravitySyllabus objective14.5.2Phototropism as a response in which• Describe phototropism as a response in which parts of a plant grow towards or away from the direction of the light sourceSyllabus objective14.5.3Gravitropism and phototropism• Investigate and describe gravitropism and phototropism in shoots and rootsSyllabus objective14.5.4Phototropism and gravitropism• Explain phototropism and gravitropism of a shoot as examples of the chemical control of plant growthSyllabus objective14.5.5Role of auxin in controlling shoot• Explain the role of auxin in controlling shoot growth, limited to: (a) auxin is made in the shoot tip (b) auxin diffuses through the plant from the shoot tip (c) auxin is unequally distributed in response to light and gravity (d) auxin stimulates cell elongationSyllabus objective