Canadian Medical Guide > Biological Sciences > Biological Phenomena, Cell Phenomena, and Immunity > Plant Physiology > Tropism > Gravitropism Terms and Definitions
Gravitropism
| Medical Definition: | The directional growth of organisms in response to gravity. In plants, the main root is positively gravitropic (growing downwards) and a main stem is negatively gravitropic (growing upwards), irrespective of the positions in which they are placed. Plant gravitropism is thought to be controlled by auxin (AUXINS), a plant growth substance. (From Concise Dictionary of Biology, 1990) |
| Guide Notes: | directional growth of a plant in response to gravity |
| Also Called: | Geotropism |
Gravitropism Medical Definitions and Terms
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