Definition of geotropism in English:

geotropism

noun ˌdʒiːə(ʊ)ˈtrəʊpɪz(ə)mdʒiəˈtroʊpɪzəm

mass nounBotany

The growth of the parts of plants in response to the force of gravity. The upward growth of plant shoots is an instance of negative geotropism; the downward growth of roots is positive geotropism.
Example sentencesExamples
- To account for the positive geotropism of roots, some researchers have proposed that under the influence of gravity, starch grains within the cells of the root fall towards the bottom of the cell.
- This is the best way to maximize grow space, minimize power consumption, and utilize geotropism to spread growth auxins throughout the plant.
- Transversal geotropism is a direction of growth that is vertical to the shoot axis.
- It was shown that gaseous ethylene inhibits both growth and geotropism in plants, and ethylene is endogenously produced by fruits.
- Geotropism occurs in two forms: positive geotropism to which the root responds by growing downward; and a negative geotropism, which causes the stem to grow upward.

Derivatives

geotropic

adjective dʒiːə(ʊ)ˈtrəʊpɪkdʒiːə(ʊ)ˈtrɒpɪkˌdʒiəˈtrɑpɪk

Botany

Cholodny proposed that ‘growth hormones play an essential role in the mechanism of the geotropic reaction’.
Example sentencesExamples
- These stem adaptations, combined with the presence of adventitious roots and negatively geotropic roots in nitrogen-fixing alders, facilitate the supply of oxygen in waterlogged soils.
- If the soil in the immediate environment is disturbed, as by excessive erosion, positive geotropic growth is stimulated within these lignotubers.
- Seed viability was assessed using the criterion of normal seedling development, i.e. emergence of the hypocotyl, radicle geotropic growth, and the opening of cotyledonary leaves.
- Also, fresh cut tulips are geotropic and phototropic, meaning that their growth is affected by gravity and light, respectively.

Origin

Late 19th century: from geo- 'earth' + Greek tropē 'turning' + -ism.

Definition of geotropism in US English:

geotropism

nounjēəˈtrōpizəmdʒiəˈtroʊpɪzəm

Botany

The growth of the parts of plants with respect to the force of gravity. The upward growth of plant shoots is an instance of negative geotropism; the downward growth of roots is positive geotropism.
Example sentencesExamples
- Geotropism occurs in two forms: positive geotropism to which the root responds by growing downward; and a negative geotropism, which causes the stem to grow upward.
- To account for the positive geotropism of roots, some researchers have proposed that under the influence of gravity, starch grains within the cells of the root fall towards the bottom of the cell.
- This is the best way to maximize grow space, minimize power consumption, and utilize geotropism to spread growth auxins throughout the plant.
- It was shown that gaseous ethylene inhibits both growth and geotropism in plants, and ethylene is endogenously produced by fruits.
- Transversal geotropism is a direction of growth that is vertical to the shoot axis.

Origin

Late 19th century: from geo- ‘earth’ + Greek tropē ‘turning’ + -ism.

单词	geotropism
释义	Definition of geotropism in English: geotropism noun ˌdʒiːə(ʊ)ˈtrəʊpɪz(ə)mdʒiəˈtroʊpɪzəm mass nounBotany The growth of the parts of plants in response to the force of gravity. The upward growth of plant shoots is an instance of negative geotropism; the downward growth of roots is positive geotropism. Example sentencesExamples To account for the positive geotropism of roots, some researchers have proposed that under the influence of gravity, starch grains within the cells of the root fall towards the bottom of the cell. This is the best way to maximize grow space, minimize power consumption, and utilize geotropism to spread growth auxins throughout the plant. Transversal geotropism is a direction of growth that is vertical to the shoot axis. It was shown that gaseous ethylene inhibits both growth and geotropism in plants, and ethylene is endogenously produced by fruits. Geotropism occurs in two forms: positive geotropism to which the root responds by growing downward; and a negative geotropism, which causes the stem to grow upward. Derivatives geotropic adjective dʒiːə(ʊ)ˈtrəʊpɪkdʒiːə(ʊ)ˈtrɒpɪkˌdʒiəˈtrɑpɪk Botany Cholodny proposed that ‘growth hormones play an essential role in the mechanism of the geotropic reaction’. Example sentencesExamples These stem adaptations, combined with the presence of adventitious roots and negatively geotropic roots in nitrogen-fixing alders, facilitate the supply of oxygen in waterlogged soils. If the soil in the immediate environment is disturbed, as by excessive erosion, positive geotropic growth is stimulated within these lignotubers. Seed viability was assessed using the criterion of normal seedling development, i.e. emergence of the hypocotyl, radicle geotropic growth, and the opening of cotyledonary leaves. Also, fresh cut tulips are geotropic and phototropic, meaning that their growth is affected by gravity and light, respectively. Origin Late 19th century: from geo- 'earth' + Greek tropē 'turning' + -ism. Definition of geotropism in US English: geotropism nounjēəˈtrōpizəmdʒiəˈtroʊpɪzəm Botany The growth of the parts of plants with respect to the force of gravity. The upward growth of plant shoots is an instance of negative geotropism; the downward growth of roots is positive geotropism. Example sentencesExamples Geotropism occurs in two forms: positive geotropism to which the root responds by growing downward; and a negative geotropism, which causes the stem to grow upward. To account for the positive geotropism of roots, some researchers have proposed that under the influence of gravity, starch grains within the cells of the root fall towards the bottom of the cell. This is the best way to maximize grow space, minimize power consumption, and utilize geotropism to spread growth auxins throughout the plant. It was shown that gaseous ethylene inhibits both growth and geotropism in plants, and ethylene is endogenously produced by fruits. Transversal geotropism is a direction of growth that is vertical to the shoot axis. Origin Late 19th century: from geo- ‘earth’ + Greek tropē ‘turning’ + -ism.
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