Uses of plant hormones

• What is the primary function of auxin in plants?

  It stimulates plant growth
• How can auxin be used in tissue culture?

  By adding auxin to stimulate growth
• What happens when cuttings are treated with auxin powder?

  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 does gibberellin help farmers with crop production?

  It induces germination at non-traditional times
• How does gibberellin affect flowering in plants?

  It can induce flowering on demand
• What is the effect of gibberellin on seedless fruit varieties?

  It helps them grow larger fruits
• What is the primary use of ethylene in fruit?

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

  It allows for better transport and sale
• How do farmers use ethylene during fruit transport?

  They expose fruit to ethylene to ripen
• What role does ethylene play at the cellular level in fruit ripening?

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

  • Auxin:
  • Stimulates growth in tissue culture
  • Promotes root development in cuttings
  • Acts as a selective weed killer
  • Gibberellin:
  • Controls seed dormancy
  • Induces flowering on demand
  • Promotes larger fruit growth
  • Ethylene:
  • Stimulates fruit ripening
  • Controls ripening during transport
• What is the focus of today's video?

  How plants respond to their environment
• Why do plants need to respond to stimuli?

  To survive in their environment
• How do plants sense light?

  By growing their shoots towards it
• What do plants do in response to gravity?

  Grow their roots downwards
• What is the role of hormones in plants?

  To control growth and responses
• How do plant hormones differ from animal hormones?

  They act locally rather than systemically
• What are auxins?

  Plant hormones that control growth
• Where do auxins accumulate in shoots?

  On the shaded side of the shoot
• What is phototropism?

  A response to light in plants
• What is geotropism?

  A response to gravity in plants
• How do shoots respond to light?

  They grow towards the light
• How do shoots respond to gravity?

  They grow away from the ground
• How does auxin accumulation affect shoot growth?

  It causes faster growth on the shaded side
• What happens to the shoot when auxins accumulate on one side?

  It curves towards the light source
• How do roots respond to light?

  They grow away from the light
• What is the effect of auxins in roots?

  They inhibit growth on the lower side
• How does gravity affect root growth?

  Auxins accumulate on the lower side
• What happens when roots are exposed to light?

  Auxins accumulate on the shaded side
• What is the result of auxin accumulation in roots?

  The upper side grows faster, curving downwards
• What are the key responses of plants to environmental stimuli?

  • Phototropism: response to light
  • Geotropism (gravitropism): response to gravity
  • Auxins control growth direction
• How do auxins affect shoot and root growth differently?

  • Shoots: Auxins stimulate growth
  • Roots: Auxins inhibit growth