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  2. Strike-slip tectonics - Wikipedia

    en.wikipedia.org/wiki/Strike-slip_tectonics

    Fault zones with dominantly reverse faulting are known as positive flowers, while those with dominantly normal offsets are known as negative flowers. The identification of such structures, particularly where positive and negative flowers are developed on different segments of the same fault, are regarded as reliable indicators of strike-slip. [8]

  3. Inversion (geology) - Wikipedia

    en.wikipedia.org/wiki/Inversion_(geology)

    Local inversion in strike-slip rhombohedral pull-aparts as a natural consequence of alternating phases of transtension with negative flower structure and transpression with positive flower structure. Complex alternating phases of extension and shortening at the margins of upper crustal rotational flakes in strike-slip zones.

  4. Transpression - Wikipedia

    en.wikipedia.org/wiki/Transpression

    These are areas of positive relief (topographic uplift), crustal shortening, and exhumation of crystalline basement. As seen in deeply eroded outcrop exposures or from subsurface geophysical surveys, restraining bends commonly define positive flower structures.

  5. ABC model of flower development - Wikipedia

    en.wikipedia.org/wiki/ABC_model_of_flower...

    ABC model of flower development guided by three groups of homeotic genes. The ABC model of flower development is a scientific model of the process by which flowering plants produce a pattern of gene expression in meristems that leads to the appearance of an organ oriented towards sexual reproduction , a flower.

  6. Gravitropism - Wikipedia

    en.wikipedia.org/wiki/Gravitropism

    Charles Darwin was one of the first to scientifically document that roots show positive gravitropism and stems show negative gravitropism. [1] That is, roots grow in the direction of gravitational pull (i.e., downward) and stems grow in the opposite direction (i.e., upwards). This behavior can be easily demonstrated with any potted plant.

  7. Floral morphology - Wikipedia

    en.wikipedia.org/wiki/Floral_morphology

    Diagram of flower parts. In botany, floral morphology is the study of the diversity of forms and structures presented by the flower, which, by definition, is a branch of limited growth that bears the modified leaves responsible for reproduction and protection of the gametes, called floral pieces.

  8. Pseudanthium - Wikipedia

    en.wikipedia.org/wiki/Pseudanthium

    The term pseudanthium was originally applied to flowers with stamens in two whorls with the outer whorl opposite the petals (obdiplostemonate) or polyandric flowers; by the early 1900s the term was repurposed by the advocates of the 'pseudanthium theory' which assumed flower evolution originated from a polyaxial instead of a monoaxial configuration.

  9. Lichtenberg figure - Wikipedia

    en.wikipedia.org/wiki/Lichtenberg_figure

    It is now known that positive Lichtenberg figures have longer, branching structures because long sparks within air can more easily form and propagate from positively charged high-voltage terminals. This property has been used to measure the transient voltage polarity and magnitude of lightning surges on electrical power lines.