Response in Plants or Turgor Movements


 
 
Concept Explanation
 

Response in Plants or Turgor Movements

Plants do not have nervous system or muscle tissue like animals, but they still show movement and response. This is because they use chemical means to convey information from one cell to another. The ability of a plant to detect change and respond to the same is termed as “sensitivity of the plant”. The movement of plants is broadly classified into two types; Autonomic and Paratonic. 

  • Autonomic movements: They occur automatically due to intrinsic reasons,for e.g: flagellar movements in the unicellular algae like Chlamydomonas,cyclosis or streaming movement of cytoplasm.
  • Paratonic or tactic movement : They are locomotary movements of complete cell or cell organelles in response to external  stimuli. They are of two types: Tropic  and Nastic movements.
  • Sample Questions
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    Question : 1

    The immediate response of plant towards the stimulus like touch is  which type of movement ?

    Right Option : A
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    Question : 2

    Which of the following are correct :

    (a) Paratonic or tactic movement occur automatically due to intrinsic reasons.

    (b) Autonomic movements occur automatically due to intrinsic reasons.

    (c) Paratonic or tactic movement are locomotary movements of complete cell or cell organelles in response to external  stimuli.

    Right Option : B
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    Explanation
    Question : 3

    Which of the following is the directional movement of plant in response to the stimulus ? 

    Right Option : D
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    Explanation
     
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