Taxi is not a term accepted by the Royal Spanish Academy (RAE) in your dictionary. The concept is used with reference to directed movement that a living being does to answer yet stimulus that it perceives.
Taxi can be negative (when the living being moves away from the source of the stimulus) or positive (The living being moves to get closer to what generates the stimulus in question). In order for the body to react to the stimulus, it must have specialized cells that act as receptors.
In order to better understand what taxi is, what should be done is to resort to the use of certain examples that can explain what it consists of and thus clarify all possible doubts that may exist in this regard.
Examples of what is positive taxi are the following:
-The earthworm lives in humid earth because it needs it to be able to live.
-A dog approaches a bitch and tries to cover her because she feels attracted by “guilt” of what animal pheronomes are.
Examples, on the other hand, of what is known as negative taxiing are these others:
-Lizards tend to stay away from cold areas since they are animals that cannot withstand this type of temperature.
-When there is a cockroach in a room and its light is turned on, it quickly tends to hide since it is an animal that does not like lighting.
Also named as taxi, taxi is classified in different ways according to the origin of the stimuli. The chemotaxis, for example, it implies a response to contact with some chemical substance. This reaction enables bacteria to move to find food, as they move to the place where there is a significant concentration of glucose or other molecules.
The phototaxis, for its part, is the taxi that originates from the light. Certain microorganisms show phototaxis when subjected to the analysis of a microscope: at first, they move away from the light emitted by the device but later, when they are in a dark place, they modify the displacement and return to the sector that is illuminated.
The anemotaxy (a reaction motivated by the wind and its direction), the thermotaxis (the movement is linked to a heat source), the thigmotaxy (response to vibrations), the hydrotaxy (reactions to water) and galvanotaxis (caused by an electric current) are other types of taxi.
In addition to all the above, it must be established that, on many occasions, when referring to the term taxi, it seems that tropism is inextricably linked to it. This must be emphasized that it is the response carried out by a plant, based on the actions of its hormones, to a specific stimulus. Specifically, the usual response is to grow.
A great example is sunflowers that move in search of sunlight as they need it to grow and develop properly.