TROPISM IN PLANTS€¦ · Do you know what is Hydrotropism , Thigmotropism or Chemotropism ? Ans:...

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Transcript of TROPISM IN PLANTS€¦ · Do you know what is Hydrotropism , Thigmotropism or Chemotropism ? Ans:...

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SEnvironmental triggers, such as light or gravity, will change the directions

that plant parts grow in. These directional, or tropic, movements can be either towards the stimulus, or away from it.

Phototropism

Geotropism

Picture Sources: https://upload.wikimedia.org/wikipedia/commons/8/8e/Phototropism.jpg

https://en.wikipedia.org/wiki/Aerial_root#/media/File:Banyan_tree_Old_Lee_County_Courthouse.jpg

Growth/bending towards the light is called PhototropismStem ususally shows positive Phototropism (and negative geotropism).The reverse is true for roots

Growth of roots towards earth is called GeotropismDo you know what is Hydrotropism , Thigmotropism or Chemotropism ?Ans: movement / growth affected by water, touch and chemicals respectively