apogeotropism

American  

[ap-uh-jee-o-truh-piz-uhm] / ˌæp ə dʒiˈɒ trəˌpɪz əm /

noun

Biology.

1. growth or orientation away from the earth; negative geotropism.

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apogeotropism British  

/ ˌæpəˌdʒɪəˈtrɒpɪk, ˌæpədʒɪˈɒtrəˌpɪzəm /

noun

1. negative geotropism, as shown by plant stems

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Other Word Forms

• apogeotropic adjective
• apogeotropically adverb

Etymology

Origin of apogeotropism

First recorded in 1875–80; apo- + geotropism

Example Sentences

The heliotropic movements of many other seedlings probably aid them in like manner in emerging from the ground; for apogeotropism by itself would blindly guide them upwards, against any overlying obstacle.

From The Power of Movement in Plants by Darwin, Charles

The hooking depends chiefly, as far as we could ascertain, on the tip being affected by epinasty and geotropism; the lower and older parts continually straightening themselves through hyponasty and apogeotropism.

From The Power of Movement in Plants by Darwin, Charles

De Vries has shown* that the more or less horizontal position of leaves is in most cases influenced by epinasty, by their own weight, and by apogeotropism.

From The Power of Movement in Plants by Darwin, Charles

Another and somewhat old hypocotyl was placed so as to stand at only 31o from the perpendicular, in which position apogeotropism acted on it with little force, and its course accordingly was slightly zigzag.

From The Power of Movement in Plants by Darwin, Charles

Besides geotropism and apogeotropism, there is, according to Frank, an allied form of movement, * 'Manual of the Botany of the Northern United States,' 1856, p.

From The Power of Movement in Plants by Darwin, Charles