SME
Grade 9 Science · Problem type
Which tropism is it?
Use this for “Why does a houseplant bend toward the window?”
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Which stimulus is the plant responding to?
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Assumptions
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A tropism is growth toward or away from a stimulus.
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The hormone auxin collects on one side of a shoot, where the cells lengthen, so the shoot bends.
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Plants: structure, transport, growth and reproduction
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