Growth or Tropic Movements


 
 
Concept Explanation
 

Growth or Tropic Movements

The movement of an organism in the direction of a stimulus or away from it is called tropic movement, or tropism. A tropic movement is said to be positive if it is directed towards the source of stimulus and negative if directed away from the source of stimulus. The plant responds by growth or turgor changes, so that parts of the plant bend towards or away from the direction of stimulus. Tropic movements are of different types in response to different stimuli. Growth-related movement of plants is quite slow.

Different types of tropic movements:

  • Phototropism (in response of light)
  • Chemotropism (in response to chemicals)
  • Thigmotropism (in response to touch stimulus)
  • Hydrotropism (in response to the water)
  • Geotropism (in response to the gravity) 
  • Sample Questions
    (More Questions for each concept available in Login)
    Question : 1

    Photoperiodism is ________________

    Right Option : B
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    Question : 2

    Pneumatophores are ______________

    Right Option : D
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    Question : 3

    The change of roots of plant when it comes in contact with the  under ground rock is called as _____________

    Right Option : C
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