PLANT HORMONES AND RESPONSES

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  • PLANT HORMONES AND RESPONSES
    • AUXIN
      • plant hormone which controls growth at the tips of shoots and roots
      • produced in tips and diffuses backwards to stimulate the cell elongation process
      • promotes growth in shoot and inhibits growth in root
    • PHOTOTROPISM
      • shoots are positively geotropic: grows towards the light
      • roots are negatively geotropic: grow away from the light
    • GEOTROPISM
      • when a shoot grows sideways, there is an unequal distribution of auxin -> shoot bends upwards meaning shoots are negatively geotropic
      • roots are positively geotropic: grows downwards towards gravity
    • EXPIREMENT:  DEMONSTRATING PHOTROPIC AND GEOTROPIC PLANT RESPONSES
      • petri dishes containing moist cotton wool and plant material put into light proof boxes
      • small slit is but into one side of the box so light can shine in
      • control seedlings can either have aluminium capos on tips or kept in a box without light
      • a clinostat is needed to demonstrate geotropism

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