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

As this upward movement occurred with plants kept in the dark and in whatever position the main peduncle was fastened, it could not have been caused by heliotropism or apogeotropism, but by hyponasty.

From The Power of Movement in Plants by Darwin, Charles

Except when already standing vertically upwards, both legs of the arch are acted on from the earliest period by apogeotropism.

From The Power of Movement in Plants by Darwin, Charles

Here then we have a good opportunity for observing how apogeotropism acts when very nearly balanced by an opposing force.

From The Power of Movement in Plants by Darwin, Charles

As apogeotropism acts more and more energetically, ellipses or loops cease to be formed, and the course becomes at first strongly, and then less and less zigzag, and finally rectilinear.

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