plant hormones 2 - commercial uses

• name 3 plant hormones

  • auxins
  • gibberellin
  • ethene
• what are 3 uses of auxins in agriculture and horticulture

  • in weed killers
  • in rooting powders
  • to promote growth in tissue cultures
• explain how auxins can be used in weed killers

  • auxins stimulate plant cells to divide and grow
  • if large amounts of auxins are added to plants, it can disrupt their growth process by overstimulating them
  • this can kill the plant
• what is a ‘selective’ weed killer

  it only kills some types of plants, not all plants
• what does it mean for a seed to be ’dormant’

  dormancy is the period in which seeds are inactive and do not grow or develop
• what does it mean for a seed to germinate

  germination is the process by which a seed starts to grow and develop
• what are 3 uses of gibberellins

  • to end seed dormancy
  • to promote flowering
  • to increase the size of fruits
• what is ethene used for

  ethene stimulates fruit to ripen, so it can be used in the food industry to control the ripening of fruit during storage and transport
• what is the effect of the widespread use of weedkillers on biodiversity

  widespread use of weed killers will reduce biodiversity, as it kills plants