Plant response

• what are the 2 stimuli for tropisms?

  • light
  • gravity
• what is the growth factor?

  • IAA auxins
• what happens in phototropism?

  • auxins move away form the light so shaded side of the plant grows more
  • In the shoots this is positive phototropism as it bends towards the light
  • in roots this is negative phototropism as it bends away from the light
• What happens in geotropism?

  • Positive geotropism roots grow towards gravity
  • Negative geotropism, shoots grow against gravity