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

In whatever position the seed may be embedded in the earth or otherwise fixed, both legs of the arch bend upwards through apogeotropism, and thus rise vertically above the ground.

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

Some other agency, however, besides apogeotropism, must come into play, either directly or indirectly, in this upward movement.

From The Power of Movement in Plants by Darwin, Charles

This momentum-like movement probably results from the accumulated effects of apogeotropism.

From The Power of Movement in Plants by Darwin, Charles

Afterwards they are carried upwards by apogeotropism in combination with hyponasty, and are thus enabled to scatter their seeds over a wider space.

From The Power of Movement in Plants by Darwin, Charles