geotropism


Also found in: Thesaurus, Medical, Encyclopedia, Wikipedia.

ge·ot·ro·pism

 (jē-ŏt′rə-pĭz′əm)
ge′o·tro′pic (jē′ə-trō′pĭk) adj.

geotropism

(ˌdʒiːəʊˈtrəʊpɪzəm)
n
(Botany) the response of a plant part to the stimulus of gravity. Plant stems, which grow upwards irrespective of the position in which they are placed, show negative geotropism
geotropic adj
ˌgeoˈtropically adv

ge•ot•ro•pism

(dʒiˈɒ trəˌpɪz əm)

n.
oriented movement or growth of an organism with respect to the force of gravity.
[1870–75]

ge·ot·ro·pism

(jē-ŏt′rə-pĭz′əm)
The growth of an organism in response to gravity. The downward growth of plant roots is an example of geotropism.

geotropic (jē′ə-trō′pĭk, jē′ə-trŏp′ĭk) adjective

geotropism

Botany. the response of a plant to the force of gravity. — geotropic, adj.
See also: Gravity
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.geotropism - an orienting response to gravity
tropism - an involuntary orienting response; positive or negative reaction to a stimulus source
Translations

geotropism

[dʒɪˈɒtrəˌpɪzm] ngeotropismo
References in periodicals archive ?
Therefore, when seeds are planted with hilum facing up, the primary root is produced close to the surface and grows around the seed toward the tube bottom, due to geotropism. In other seed positions, this was not observed because the radicle in the seed was facing down or lying on its side, and it favored seedling emergence at these positions.
Auxin elongates subapical cells and affects phototropism, geotropism, and fruit development.
The reason may be more porosity and aeration that enhances roots penetration more deeply in sand media due to geotropism and attains more length.
Growth regulator like [GA.sub.3] and NAA affects flower and fruit setting, cell growth, apical dominance, geotropism and photoperiod.
The "Malaise" portion is efficient in sampling insects with negative geotropism, and the "window" portion is efficient in sampling insects with positive geotropism (Basset, 1988).
The term tropism existed previously in botany, back-formed from more specific terms for responses to stimulus, such as heliotropism, the tendency of plants to grow toward a light source, and geotropism, the response to gravity in orienting the plant's structure.
Lacri: lacrimination, Sali: salivation, Diah: diarrhoea, Resp: respiratory distress, Leth: lethargy, Con: convulsions, Ste: stereotypy, Tre: tremors, Cat: catalepsy, Geo: effect on positive geotropism, Ret: retropulsion, Stu: stupor, Exe: excitement, x: absence of symptom, [check]: presence of symptom.