Geotropism
Geotropism (pronunciation: /dʒiːəʊˈtrɒpɪz(ə)m/), also known as Gravitropism, is a biological phenomenon that refers to the growth or movement of plants in response to gravity. The term is derived from the Greek words "geo" meaning earth and "tropos" meaning turn.
Etymology
The term "Geotropism" was first used in the 19th century and is derived from the Greek words "geo" meaning earth and "tropos" meaning turn. The term "Gravitropism" is a more recent term that emphasizes the role of gravity in this process.
Types of Geotropism
There are two main types of Geotropism: Positive Geotropism and Negative Geotropism. Positive Geotropism is when parts of the plant grow towards the gravitational pull, such as the roots. Negative Geotropism is when parts of the plant grow against or away from the gravitational pull, such as the stems and leaves.
Related Terms
- Tropism - A general term for the movement or growth of an organism in response to a stimulus.
- Phototropism - The growth or movement of a plant in response to light.
- Hydrotropism - The growth or movement of a plant in response to water.
- Thigmotropism - The growth or movement of a plant in response to touch or physical contact.
See Also
External links
- Medical encyclopedia article on Geotropism
- Wikipedia's article - Geotropism
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