plant hormones 1 - auxins

• which stimuli can plants detect

  • light
  • gravity
  • touch
  • water
• how do plant hormones act differently to human hormones

  plant hormones only act locally, whereas human hormones travel throughout our bodies
• what is a tropism

  a tropism is a growth in response to a stimulus, which may lead to a change in the direction of a shoot or root
• what are auxins

  auxins are a family of plant hormones
• where in the plant are auxins made

  in the growing top of the roots and shoot
• what happens to auxins once they’re produced

  they diffuse backwards along the root or shoot
• what is phototropism

  a tropism in response to light
• what is gravitropism (also known as geotropism)

  a tropism in response to gravity
• what effects do auxins have on plant shoots

  stimulate cell/plant growth
• what effect do auxins have on plant roots

  inhibit cell/plant growth
• do auxins accumulate on the light or dark side of a shoot/root

  light breaks down auxin, so there will be more auxin on the dark side
• do auxins accumulate on the top or bottom side of a shoot/root

  gravity pulls auxin downwards, so there will be more auxin on the lower side
• are shoot positively or negatively phototropic, what does this mean

  shoot are positively phototropic, which means they will grow towards the light
• are shoots positively or negatively gravitropic (geotropic), what does this mean

  shoots are negatively gravitropic, this means they will grow away from gravity (so upwards)
• are roots positively or negatively phototropic, what does this mean

  roots are negatively phototropic, which means they will grow away from the light
• are roots positively or negatively gravitropic (geotropic), what does this mean

  roots are positively gravitropic, this means they will grow towards gravity (so downwards)