Plant Hormones

• What are the three plant hormones discussed in the video?

  Auxin, gibberellin, and ethylene
• Why are auxins considered growth hormones?

  They stimulate plants to grow
• How can auxins be used in tissue culture?

  To stimulate growth of plant clones
• What happens when cuttings are treated with rooting powder containing auxin?

  They produce roots and grow into new plants
• How do auxins function as selective weed killers?

  They disrupt growth patterns in broad-leaved weeds
• What are the three main uses of gibberellin?

  Controlling dormancy, inducing flowering, growing larger fruit
• What is dormancy in seeds?

  Period before growth starts
• How can farmers use gibberellin to increase crop yield?

  By inducing germination at optimal times
• How does gibberellin affect flowering in plants?

  It can induce flowering on demand
• How does gibberellin help in growing larger fruits?

  It promotes growth in seedless fruit varieties
• What is the primary use of ethylene in fruit production?

  To stimulate the ripening of fruit
• Why is controlling the ripening process of fruit important?

  To manage transport and sale of fruit
• How do farmers use ethylene during fruit transport?

  To ripen fruit after transport
• How does ethylene work at the cellular level?

  It stimulates an enzyme that causes ripening
• What are the commercial uses of auxin, gibberellin, and ethylene?

  • Auxin:
  • Stimulates growth
  • Used in tissue culture
  • Kills broad-leaved weeds
  • Gibberellin:
  • Controls dormancy
  • Induces flowering
  • Grows larger fruits
  • Ethylene:
  • Stimulates fruit ripening
  • Controls ripening during transport