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4th Grade Natural Science: Plants

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  • _______ occur when plants grow in a particular direction in response to a stimulus.
    Tropic
  • _______ movements occur when the plant doesn't grow in a particular direction.
    nastic
  • _______ are underground stems that grow horizontally.
    Rhizomes
  • What is it called when plants grow in the direction of sunlight?
    Phototropism
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