Tropism
Tropism
Tropism (/ˈtroʊpɪzəm/; from Greek τρόπος, tropos, "a turning") is a biological phenomenon, indicating growth or turning movement of a biological organism, usually a plant, in response to an environmental stimulus.
Etymology
The term "tropism" is derived from the Greek word "tropos", which means "a turning". It was first used in the late 19th century to describe the ability of plants to move or grow towards or away from stimuli.
Types of Tropism
There are several types of tropism, including:
- Phototropism: The growth or movement of a plant in response to light stimulus.
- Geotropism: The growth or movement of a plant in response to gravity.
- Thigmotropism: The growth or movement of a plant in response to touch or physical contact.
- Hydrotropism: The growth or movement of a plant in response to water.
- Chemotropism: The growth or movement of a plant in response to particular chemicals.
Related Terms
- Stimulus (biology): Any external or internal change that brings about a response in an organism.
- Growth (biology): The process of increasing in physical size.
- Plant physiology: The study of the functioning, or physiology, of plants.
External links
- Medical encyclopedia article on Tropism
- Wikipedia's article - Tropism
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