Plant hormones use

• What is the commercial use of auxin in tissue culture?

  Auxin is added to growth medium
• What do similar cells do when auxin is added to the growth medium?

  They divide to form both roots and shoots
• How are cuttings used in plant propagation?

  Add cuttings to soil and rooting powder
• What effect does rooting powder have on cuttings?

  It helps cuttings produce more growth
• How do auxins kill weeds?

  They are added to a weed, causing death
• What type of plants are most weeds?

  Broad-leaved plants
• What is the purpose of selective weedkillers using auxins?

  They affect broad-leaved plants only
• What are gibberellins used for in plants?

  Seed germination, stem growth, and flowering
• What is dormancy in seeds?

  Seeds won't germinate without perfect conditions
• How does gibberellin affect seed germination?

  It allows seeds to germinate out of season
• What benefit do farmers get from using gibberellin?

  They can grow multiple crops per year
• How does gibberellin induce flowering in plants?

  It allows flowering without environmental changes
• What happens to seedless fruits when gibberellin is added?

  They grow larger than seeded fruits