plant hormones and uses

• Where are auxins mostly made in plants?

  In the tips of the shoots and roots
• What effect do auxins have on plant cell elongation?

  They change the rate of elongation
• How do shoots and roots respond to high concentrations of auxins?

  • Shoots grow more
  • Roots grow less
• What is geotropism in plants?

  Response to gravity affecting growth direction
• How does gravity affect auxin distribution in horizontally running shoots and roots?

  It causes auxin to gather at the bottom
• What is the effect of auxin on roots and shoots due to gravity?

  Roots grow down, shoots grow up
• What is phototropism in plants?

  Response to light affecting growth direction
• How does auxin behave in relation to light sources?

  It builds up on the shady side
• How can auxin be used as rooting powder?

  It causes stem cells to differentiate into root cells
• What is positive geotropism in plants?

  Growth of roots downwards
• How does auxin function as a weed killer?

  It causes weeds to grow too quickly and die
• What are the uses of gibberellins in plants?

  • End seed dormancy
  • Promote flowering
  • Increase fruit size
• What role do gibberellins play in seed germination?

  They initiate the germination process
• What is the effect of low concentrations of gibberellins?

  They increase the speed of germination
• What is ethene used for in the food industry?

  To provide controlled ripening of fruit
• What happens to bananas when they are exposed to ethene?

  They ripen quickly
• How does ethene affect other fruits when bananas are stored together?

  It causes them to ripen quickly