auxins pt 1

• What are plant tropisms?


  The growth of a plant in response to a stimulus
• What is positive tropism?

  The growth of a plant towards a stimulus
• What is negative tropism?

  The growth of a plant away from a stimulus
• What are the two main types of plant tropism?

  Phototropism and gravitropism
• Define phototropism.

  A plant’s growth response to light
• Define gravitropism.

  A plant’s growth response to gravity
• What are auxins?


  A group of plant hormones involved in plant tropisms , control growth in plant roots and shoot tips
• How do auxins affect plant shoots and roots?

  They stimulate growth in shoots and inhibit growth in roots
• Where are auxins produced?

  Root and shoot tips
• How do auxins move through a plant?

  They diffuse through the plant in solution
• Are plant shoots positively or negatively phototropic?

  Positively phototropic , plant shoots grow towards the light
• Are plant shoots positively or negatively gravitropic?

  Negatively gravitropic , plant shoots grow upwards against gravity
• Are plant roots positively or negatively phototropic?

  Negatively phototropic , plant roots grow away from light
• Are plant roots positively or negatively gravitropic?

  Positively gravitropic , roots grow downwards , towards gravity