Difference between Tropic Movements and Nastic Movements – Comparison Table


Tropic vs Nastic Movments

Tropic Movements vs Nastic Movements
Similarities and Differences between Tropic Movements and Nastic Movements in Plants

Tropic movements and Nastic movements are the two types of induced or paratonic movements of curvature in plants.

Tropic movements: The paratonic (induced) movement of growth is called tropic movements. Here the stimuli are external and unidirectional. Example: phototropic movements (movement towards the light) geotropic movements (movement towards gravity), chemotropic movements (movement towards chemicals) etc.

What is Phototropism

Nastic movements: The paratonic movements of variations are called nastic movements. Here the stimuli are external and diffused (not unidirectional). Example: nyctinastic movements (movements in response to darkness), Seismonastic movements or Thigmonastic movements (movements in response to touch) etc.

What is Nastic Movment

The present post discusses the Similarities and Differences between Tropic Movements and Nastic Movements in Plants with a Comparison Table.

Similarities between Tropic Movements and Nastic Movements

Ø  Both tropic movements and nastic movements are vital movements.

Ø  Both are the movements of curvature.

Ø  Both are paratonic (induced) movements.

Ø  Both types of movements are induced by external stimuli.

Difference between Tropic Movements and Nastic Movements

Sl. No.Tropic MovementsNastic Movements
1Tropic movements are paratonic movements of growth.Nastic movements are paratonic movements of variations.
2Example: Movement of shoot towards the sunlight (phototropic movement).Drooping of the leaves of Mimosa pudica due to touch (Thigmonastic movement).
3Tropic movements are shown by plant organs with radial symmetry (such as root and stem).Nastic movements are shown by plant organs with bilateral symmetrical (flat) such as leaves and stomata.
4Stimuli for the tropic movements are unidirectional and never diffused.The stimuli for the nastic movements may be unidirectional or diffused.
5The tropic movements are related to the direction of stimuli.Nastic movements are NOT related to the direction of stimuli.
6Tropic movements are comparatively slow movements.Nastic movements are quick movements.
7Tropic movements are caused by the cell divisions in the organ.The nastic movements are caused by the change in the turgor pressure of the cells in the organ.


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