plant hormones

• where is auxin fount in a plant

  in the tips of stems and roots
• auxin


  a plant hormone
• what does auxin do

  controls plant growth in response to light and gravity
• what is plant growth in response to light called

  phototropism
• what is plant growth in response to gravity called

  gravitropism
• when shoots are exposed the light, which side will accumulate more auxin

  shaded side
• Roots show ______ phototropism

  Negative
• Shoots show ______ phototropism

  Positive
• Roots show ______ gravitropism

  Positive
• Shoots show ______ gravitropism

  Negative
• Why do plant produce hormones

  For growth responses towards stumuli
• How do plant hormones travel from the site of production to the site of action

  Diffusion
• Auxin in the tips of shoots stimulate growth
• Auxin in the tips of roots inhibit growth
• How do auxin cause a plant to bent towards light

  Accumulates on the shaded side which stimulates growth and it bends to the light
• what can auxins be used for

  killing weeds

  growing from cutting with rooting powder

  growing cells in tissue culture
• what can gibberellin be used for

  controlling dormancy - lots of seeds won't germinate unless they've been through certain conditions

  inducing flowering - cause plants to flower

  growing larger fruits - seedless variations of fruit often do not grow as large as a seeded variation
• Gibberellin 


  A plant hormone
• what can ethene be used for


  fruit ripening - ethene is a gas that stimulates enzymes that cause fruit to ripen. this means that fruit can be picked while it's still unripe then gas is added on the way to the supermarket so it will be perfect as it reaches the shelves