Plant hormones

• Stimuli


  Something that makes an organism respond
• Photo

  light
• Phototropism


  growth in response to light
• Gravitropism

  growth in response to gravity
• The main function of auxins is to promote cell elongation.
• positivite tropism?

  growth towards stimulus
• in which parts of plants do auxinscontrol growth?

  roots and shoots
• By which proccess do auxins travel?

  diffusion
• which side of plant do auxins accumalate on?

  shaded
• why is there more growth on shaded side of plant?

  auxins are concentrated on shaded side causing it to grow rapidly
• which process occurs in roots?

  positive gravitropism
• which process occurs in shoots?

  positive phototropism
• what type of weedkillers can auxins be used for?

  selective
• how does selective weedkillers work?

  disrupt growth patterns of weeds resulting in abnormal growth and death
• what type of powder are auxins used in?

  rooting powder
• what are cuttings?


  small pieces of plant
• How is rooting powder used?

  it is added to stalk of the cutting and stalk produces roots quicker due to auxins
• what do the cuttings eventually grow into?

  fully developed plants
• How do GIbberilins increase crop yield?

  they increase germination and stimulate flower and fruit production
• How do Gibberlins develop seedless fruits?

  stop development of seeds in fruits
• What do auxins do in the roots?

  inhibit cell elengation
• What is Ethene used for?

  To ripen fruits