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tropism
(Encyclopedia)tropism trōpˈĭzəm [key], involuntary response of an organism, or part of an organism, involving orientation toward (positive tropism) or away from (negative tropism) one or more external stimuli. ...taxis
(Encyclopedia)taxis tăkˈsĭs [key], movement of animals either toward or away from a stimulus, such as light (phototaxis), heat (thermotaxis), chemicals (chemotaxis), gravity (geotaxis), and touch (thigmotaxis). ...auxin
(Encyclopedia)auxin ôkˈsĭn [key], plant hormone that regulates the amount, type, and direction of plant growth. Auxins include both naturally occurring substances and related synthetic compounds that have simila...nastic movement
(Encyclopedia)nastic movement, in botany, the movement of plant parts in response either to certain external stimuli or to internal growth stimuli. Nastic movements, which are generally slow, can be observed by tim...Loeb, Jacques
(Encyclopedia)Loeb, Jacques lōb [key], 1859–1924, American physiologist, b. Germany, M.D. Univ. of Strasbourg, 1884. He came to the United States in 1891 and taught at Bryn Mawr, the Univ. of Chicago, and the Un...Browse by Subject
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