plant hormones

• Plant hormones


  Substances that occur naturally in plants and stimulate or inhibit growth
• Geotropism


  • Plants grow in response to gravity
• Gravitropism


  Plants grow downwards to get into soil and minerals
• Auxin


  Plant hormone that promotes cell growth and cell division
• Auxin


  Produced in tip, dissolves and diffuses backwards
• Auxin


  • Accumulates on the shaded side
• Phototropism


  Plants grow towards light
• Geotropism


  Plants grow downwards in response to gravity
• Auxin


  Inhibits growth on the side where it accumulates
• Auxin


  Stimulates growth on the side where it is produced
• Auxin


  Accumulates on the shaded side, causing the plant to bend towards light
• Auxin


  A plant hormone that stimulates growth
• Auxin is used on the lower side of a stem to promote growth</b>
• Auxin is used on cuttings to promote root growth</b>
• Auxin is used commercially in a narrow level plane</b>
• Gibberellin 3 is used commercially to control dormancy and induce flowering on demand</b>
• Gibberellin 3 is used commercially to promote growing larger fruit</b>
• Ethene is used commercially in weedkillers</b>
• Ethene stimulates ripening of fruit</b>
• Ethene is used to pick fruit before it's ripe, transport it, and then add ethere to make it ready for sale</b>