auxins notes

• what are auxins

  plant hormones that control the growth in the roots and the shoots
• What is a plant tropism

  a plants growth in response to stimulus
• what is geotropism

  • growth in response to gravity
• what is phototropism

  • growth in response to light
• where are auxins produced and how they move around the leaf

  • produced in tips of roots and shoots
  • move around the leaves by diffusing in solutions
• Why are shoots positively phototropic

  • auxins accumulate on the shaded side of the plant
  • stimulating cell elongation and growth on the shaded side
  • causes the plant to bend towards light source
• what is the relationship between auxins and shoots and roots

  • auxins stimulate growth in shoots
  • auxins inhibit growth in roots
• why are shoots negatively geotropic

  • auxins stimulate growth via cell elongation on the bottom side of the root
  • causing it to grow faster than the top side
  • and bend upwards away from gravity
• why are roots positively geotropic

  • auxins inhibit growth on the bottom side on the root
  • causing the top side to grow faster
  • and bend towards the ground towards gravity
• why are roots negatively phototropic

  • roots are negatively phototropic because auxins accumulate on the shaded side
  • inhibiting growth and bending away from the light source as it bends downwards
• How are auxins used in commerical uses

  • auxins are used in plant cuttings (sections of a plant) in soil to stimulate growth and create multiple copies of the plants
  • they are also used in the killing of weeds as the disrupt the weeds growth patterns causing it to grow too fast and die
• how are gibberlings used in commerical use

  • gibeerlings are used in commerical use as the promote plant growth when they normally wouldn't grow via seed formation.
  • and they reduce flower formation to increase the likely hood of better plants
• how is ethene used in commericasl use

  • fruit ripening
  • plants are picked when they are unripe so they are hard and aren't damaged via transportation
  • when they have been transported ethene is used to ripen the fruit so they can be consumed