Plant hormones

• Plant hormones

  • Auxins
  • Gibberlins
  • Ethene
• Auxins


  Control cell elongation
• Negative Geotropism


  When root grows in the direction opposite to gravity
• Positive Phototropism


  Plant grows towards the stimulus of light
• Gibberellins


  Plant hormone responsible for stem growth and development
• Ethene


  • Speeds up ripening in bananas and other fruit
  • Increases fruit size
• Posotive geotropism 


  When roots grow in the direction of gravity
• Negative phototropism 


  Plant grows away from light
• Auxins 


  Move to the shaded area of the plant

  That side of the plant elongates therefore it grows towards the light
• Uses of auxins 


  Weed killers and root powders