plant hormones

• What do plants produce to regulate growth and respond to environmental stimuli?

  Hormones
• What is phototropism in plants?


  Growth response towards light
• What is gravitropism in plants?


  Growth response to gravity
• What are auxins responsible for in plants?


  Promoting cell elongation in shoots and inhibiting growth in roots
• How do unequal distributions of auxins affect plant growth?


  They lead to differential growth rates, causing bending towards light or away from gravity
• What is the effect of positive phototropism?


  Growth towards light
• What is the effect of negative gravitropism?


  Growth away from gravity
• What role do gibberellins play in plants?


  They initiate seed germination, promote stem elongation, and influence flowering
• What is ethene and its role in plants?


  A gaseous hormone that regulates cell division and ripening of fruits
• What is the method for investigating the effect of light or gravity on newly germinated seedlings?


  • Record results using length measurements
  • Create labeled biological drawings to illustrate effects
• What are the applications of plant hormones in agriculture and horticulture?

  • Auxins:
  • Weed killers targeting broadleaf weeds
  • Rooting powders for plant cuttings
  • Tissue culture for cell division
  • Ethene:
  • Controls ripening of fruits
  • Gibberellins:
  • Help end seed dormancy
  • Promote flowering
  • Increase fruit size
• How do auxins function as weed killers?


  They selectively target broadleaf weeds without harming crops
• What is the purpose of rooting powders in plant propagation?


  To promote root development in plant cuttings
• How is ethene used in the food industry?


  To control the ripening process of fruits
• What effect do gibberellins have on seed dormancy?


  They help end seed dormancy
• How do gibberellins affect flowering in certain plants?


  They promote flowering
• What is the effect of gibberellins on fruit size?


  They increase the size of fruits, making them more marketable