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| Plant Movements |
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| Movement in plants may not be very pronounced, but it is brought about by definite external and internal stimuli. Movement which occur due to external stimuli are known as induced or paratonic movements and the movements which occur due to factors inherent inside the plant body itself are known as autonomic or spontaneous movements. |
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| Plant movements are of two types. |
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| i) Autonomic or Spontaneous Movements |
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| ii) Paratonic or Induced Movements |
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| These are of three kinds. |
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| i) locomotion movements |
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| ii) Growth and Curvature Movements |
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| iii) Variation Movements |
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| They involve movement of the complete cell or organelle, and is influenced by external stimuli. |
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| These are: |
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| Tactic movements |
| These include phototactic, thermotactic and chemotactic movements. |
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| Phototaxis is the movement brought about in response to light. |
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| Thermotaxis is the movement shown in response to heat. |
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| Chemotaxis is the movement brought about due to some chemical substances. |
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| Tropic Movements |
| These include phototropism, geotropism, chemotropism, hydrotropism and thigmotropism. |
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| Nastic movements |
| photonasty, thermonasty, nyctinasty, seismonasty and hyponasty. |
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| Hydroscopic movements |
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| Seismonastic movements |
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