PLANT HORMONES

• Plant hormones


  Coordinate and control growth and responses to light and gravity
• Auxin


  Causes unequal growth rates in plant roots and shoots
• Gibberellins


  Important in initiating seed germination
• Ethene


  Controls cell division and fruit ripening
• Required practical: effect of light or gravity on seedling growth


  Record results as length measurements and labelled biological drawings
• Uses of plant hormones

  • Auxins as weed killers, rooting powders, and for tissue culture
  • Ethene to control fruit ripening
  • Gibberellins to end seed dormancy, promote flowering, and increase fruit size