AQA GCSE Biology Unit 1 2.3 Plant control

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  • Control in plants
    • Auxin- growth hormone
      • promotes growth in the shoot
      • Inhibits gowth in shoot
    • Phototropism
      • Light shines on shoot- more auxin accumulates on the shaded side- unequal distribution
        • greater auxin percentage on shaded side
          • Shaded side grows faster
            • Plant bends towards light
        • Auxin breaks down in light
    • Geotropism/ gravitropism
      • Gravity causes uneven distribution of auxin
        • Underside of the root grows slower than the upper side making the root pint forwards
    • Agriculture
      • Cutting is dipped in rooting powder then put into compost to produce identical plants

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