What is the difference between Tropic movement and Nastic movement?

Question

Answer

#TROPIC MOVEMENT:- growth movement of plant part in response to an external stimulus in which the direction of stimulus determines the direction of response is called tropic movement. ex.. hydrotropism, geotropism.

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#NASTIC MOVEMENT:- the movement of a plant part response to an external stimulus in which the direction of response is not determined by the direction of stimulus is called Nastic Movement. ex. thigmonasty.

Answer

Tropic movements are found virtually in all plants but nastic movements are mostly found in specialized plants and organs. In tropic movements, there is directional growth of a plant, or part of a plant, in response to an external stimulus such as gravity or light. ... Most nastic movements are temporary and reversible.

Answer

→Nastic movements are non directional responses to stimuli such as temperature and heat.
→The most important feature of this type of movement is that movements are not governed by the direction of the stimulus.
→They may be induced by touch (seismonastic), temperature (Thermonastic), light, and chemicals.
→Whatever be the direction of stimulus, the movements always occur in a particular direction without reference to the direction of the stimulus
→Example of seismonastic movement is movement of Venus fly trap.

while

→Tropic movement is the response to stimuli that comes from one direction.
→ It is a directional movement.
→If the movement of the plant part is towards the stimulus, then it is known as positive tropism . If the movement of the plant part is away from the stimulus, then it is known as negative tropism .
→For example phototropism, Geotropism etc.

Tropisms and nastic movements are both plant responses to external stimuli. however tropisms are depend on the direction of the stimulus nastic movements do not depend on the direction of a stimulus

Answer

Sl. No.Tropic MovementsNastic Movements1Tropic 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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