investigations for photo and geotropism

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Last updated 5:20 PM on 1/25/26
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4 Terms

1
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Phototropism investigation

  • used coleoptiles: wheat.

  • control

  • no tip

  • covered w opaque cap

  • covered w transparent cap

  • opaque shield


2
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phototropism findings

  • no tip: no growth

  • opaque tip: no growth

  • transparent, shield: tropism.

  • shows tip is responsible for growth

  • gelatin: permeable so signal is a mobile chemical


3
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geotropism investigation

  • clinostat.

  • spins plant to ensure gravity equal on all sides.


4
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geotropism findings

  • growth is even throughout the plant