Plant hormones

• what are the uses of gibberellin?

  to increase fruit size and to promote flower production
• Plants produce hormones to coordinate and control growth and responses to light (phototropism) and gravity (geotropism). Unequal distributions of auxin cause unequal growth rates in plant roots and shoots.
• Ethene controls cell division and ripening of fruits.
• Auxins are used:

  • as weed killers

  • as rooting powders

  • for promoting growth in tissue culture.
• Ethene is used in the food industry to control ripening of fruit during storage and transport.
• Gibberellins can be used to:

  • end seed dormancy

  • promote flowering

  • increase fruit size
• what is happening here?

  Auxin is on the shaded side of the plant away from light . Auxin makes cells grow faster so shoot bends towards the light

  
• what part of the plant shows negative tropism in response to gravity?

  shoots
• in which direction does a root showing negative phototropism grow?

  down
• what process do gibberellins initiate in plants?

  end seed dormancy - cause seeds to germinate

  flower production

  increase fruit size
• what hormone helps gardeners to grow plants?

  Auxin