plant hormones

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  • plant hormones
    • plants produce hormones to co-ordinate and control growth
    • phototropism (light)
      • light breaks down auxins and they become unequally distributed in the shoot
      • the side with the highest concentration of auxins has the highest growth rate and the shoot grows toward the light
    • geotropism or gravitropism (gravity)
      • gravity causes an unequal distribution of auxins
      • in the roots the side with the lowest concentration has the highest growth rate and the root grows in the direction of gravity
      • In new shoots from a seedling the unequal distribution of auxins causes the shoot to grow away from the gravity
    • gibberellins
      • important in initiating seed germination
    • ethene
      • controls cell division and ripening of fruits

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