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

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

The sheath-like cotyledons of Phalaris Canariensis are extremely sensitive to apogeotropism.

From The Power of Movement in Plants by Darwin, Charles

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

As it could not have been strongly acted upon by apogeotropism in the above slightly inclined position, we expected that it would have circumnutated, or at least have moved in a zigzag course.

From The Power of Movement in Plants by Darwin, Charles

Different species and different parts of the same species are acted on by apogeotropism in very different degrees.

From The Power of Movement in Plants by Darwin, Charles