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What are the different kinds of tropisms in plants?

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lehcir | Student | Valedictorian

Posted March 30, 2013 at 5:55 AM via iOS

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What are the different kinds of tropisms in plants?

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jerichorayel | College Teacher | (Level 1) Senior Educator

Posted March 31, 2013 at 8:11 AM (Answer #1)

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Tropism is a biological phenomenon wherein an organism is able to respond to the stimulus brought by the environmental factors. Those tropisms are listed as follows:

  • Chemotropism -> movement or growth in response to chemicals from the outside of plants or inside of the body system. 
  • Gravitropism-> movement or growth in response to gravity. Example of this is the movement of roots downward (positive) and the growing of stems upward (negative).
  • Heliotropism -> movement or growth in response to the direction of sunlight. 
  • Sonotropism -> movement or growth in response to sound.
  • Hydrotropisms-> movement or growth in response to water; plants tend to bend to an area with higher humidity. 
  • Phototropism-> movement or growth in response to light (or colors of lights). Reaction can be toward (positive) or away (negative) from the light.
  • Thermotropism -> movement or growth in response to temperature. An example is the curling of Rhododendron leaves in response to cold temperatures.
  • Electrotropism-> movement or growth in response to an electric field
  • Thigmotropism -> movement or growth in response to touch or contact stimuli. There are plants that close its leaves when being touched (Mimosa pudica).

 

 

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