The response is learned and varies over time.
An example of external stimuli is a loud noise that causes someone to cover their ears or flinch in response.
for example by sleeping when the sun goes down, or by reacting to fire
Innate behavior (novanet)
The dogs' response was as eager as a child on Christmas morning.
An example of a nastic response is the closing of a Venus flytrap's lobes when an insect touches its sensitive trigger hairs. This rapid movement is not directed toward the stimulus but occurs in response to mechanical stimulation, allowing the plant to capture its prey. Another example is the folding of a Mimosa pudica leaf when touched, which serves as a defense mechanism against herbivores.
Nastic response occur in a part of a plant that grows towards a non-directional stimulus while Tropic response occur in a part of a plant that grows towards or away from a directional stimulus.
nastic movement in botany, the movement of plant parts in response either to certain external stimuli or to internal growth stimuli. Nastic movements, which are generally slow, can be observed by time-lapse photography. Such movements as those of developing buds, which swell, open up, and eventually fall off, are examples of internally directed, or autonomic, nastic movements
A directional plant response, also known as tropism, is the growth or movement of a plant in response to a directional stimulus, such as light, gravity, or touch. For example, phototropism is when a plant grows towards a light source. These responses allow plants to adjust their growth and development to optimize their chances of survival and reproduction.
A responsive movement of a plant that is not dependent on the direction of the stimulus is called a non-directional or non-tropic movement. Examples of non-directional movements in plants include thigmonasty (response to touch), nastic movements (response to changes in environmental conditions), and nyctinasty (response to changes in light).
Nastic movements are non-directional responses to external stimuli, triggered by changes in environmental factors like temperature or humidity. These movements are not correlated with the direction of the stimulus. Tropic responses, on the other hand, involve directional growth or movement of an organism in response to a stimulus, such as phototropism (response to light) or gravitropism (response to gravity).
Tropic responses are called tropism. It is the growth or turning movement of plants in response to an environmental stimulus. Nastic movements are non-directional responses to stimuli, independent of the stimulus's position.
Most nastic movements in plants are triggered by changes in environmental factors such as light, temperature, humidity, and touch. These movements are non-directional and usually involve swelling or shrinking of specialized cells in plants, causing a response such as opening or closing of leaves or petals.
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
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Mimosa pudica exhibits thigmonastic movement, a type of nastic movement in response to touch or physical stimulus. When stimulated, the plant's leaves close up or fold in a rapid response to protect itself.
Tropism: a growth response of a plant towards or away from a stimulus, such as light or gravity. Taxis: a directed movement of an organism towards or away from a stimulus, such as movement towards food or away from danger. Nastic movement: a non-directional response of plants to a stimulus, like the folding of leaves in response to touch or changes in humidity.