Gravitropism (also known as geotropism) is a turning or growth movement by a plant, fungus, or animal in response to gravity. It is a general feature of all higher and many lower plants as well as other organisms. Charles Darwin was one of the first to scientifically document that roots show positive gravitropism and stems show negative gravitropi...
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http://en.wikipedia.org/wiki/Gravitropism
(from the article `angiosperm`) ...of root systems are a primary root system and an adventitious root system. The most common type, the primary system, consists of a taproot ... ...growing organs, such as opening buds, and are transported away from tips of shoots toward the base of the plant, where they stimulate the cells to ... In ...
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http://www.britannica.com/eb/a-z/g/61
The growth response to gravity in plants. The term comes from the Latin gravis for 'heavy' and tropes for 'turning'. Gravitropism was formerly known as geotropism.
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http://www.daviddarling.info/encyclopedia/G/gravitropism.html
Directional growth of a plant organ in response to a gravitational field roots grow downwards, shoots grow upwards. Achieved by differential growth on the sides of the root or shoot. A gravitation field is thought to be sensed by sedimentation of statoliths (starch grains) in root caps. ... (18 Nov 1997) ...
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http://www.encyclo.co.uk/local/20973
Directional growth of a plant organ in response to a gravitational field - roots grow downwards, shoots grow upwards. Achieved by differential growth on the sides of the root or shoot. A gravitation field is thought to be sensed by sedimentation of statoliths (starch grains) in root caps.
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movement of plants in response to gravity
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https://sciencetrek.org/sciencetrek/topics/botany/glossary.cfm
The bending of a plant organ in response to gravity; also called geotropism.
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https://www.encyclo.co.uk/local/22581
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