Uses of plant hormones

• What do plant hormones control and coordinate?

  Growth and responses to environmental stimuli
• How do scientists and farmers use plant hormones?

  To manipulate plant growth in agriculture
• What are the key plant hormones and their functions?

  • Auxins: Control cell elongation, root and shoot growth, tropisms
  • Gibberellins: Stimulate seed germination, stem growth, flowering
  • Ethene: Controls fruit ripening
• Where are auxins found in plants?

  Tips of shoots and roots
• What is the function of gibberellins?

  Stimulate seed germination, stem growth, flowering
• Where is ethene found in plants?

  Ripening fruits and aging leaves
• What are the commercial uses of auxins?

  • Rooting powders for plant propagation
  • Selective weed killers for broad-leaved weeds
  • Controlling growth through tropisms
• How do rooting powders work?

  They help cuttings develop new roots
• What effect do auxin-based weed killers have on broad-leaved weeds?

  They cause uncontrollable growth, leading to death
• How do auxins affect plant tropisms?

  They cause phototropism and gravitropism
• What are the commercial uses of gibberellins?

  • Promoting seed germination
  • Inducing flowering regardless of conditions
  • Increasing fruit size for market appeal
• How do gibberellins promote seed germination?

  They break seed dormancy for uniform germination
• What conditions do gibberellins override for flowering?

  Temperature or day length requirements
• How are gibberellins used in commercial flower production?

  To induce flowering all year round
• How do gibberellins affect fruit size?

  They stimulate larger fruit growth
• What are the commercial uses of ethene?

  • Speeding up fruit ripening for transport
  • Delaying ripening for long-term storage
• How does ethene speed up fruit ripening?

  It ripens fruit just before sale
• What is the purpose of delaying ripening with chemicals?

  To prevent fruit from spoiling during storage
• What are the summarized commercial uses of plant hormones?

  • Auxins: Rooting powders, selective weed killers, controlling growth
  • Gibberellins: Promoting seed germination, inducing flowering, increasing fruit size
  • Ethene: Speeding up fruit ripening, delaying ripening for storage