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14.5 Tropic responses

Syllabus
0610–2026–2027
Topic
14.5
Level
—

14.5.1—Gravitropism as a response in which

  • Describe gravitropism as a response in which parts of a plant grow towards or away from gravity

14.5.2—Phototropism 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 source

14.5.3—Gravitropism and phototropism

  • Investigate and describe gravitropism and phototropism in shoots and roots

14.5.4—Phototropism and gravitropism

  • Explain phototropism and gravitropism of a shoot as examples of the chemical control of plant growth

14.5.5—Role 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 elongation

Objective notes

5 learning objectives
ConceptIGCSE Biology