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Plant Signaling, Movement, and Growth: Hormones and Nutrients

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Terms in this set (20)

  • Auxins (hormone)

    Auxins promote cell elongation and bending in plants.

  • Cytokinins (hormone)

    Cytokinins stimulate cell division in plants.

  • Ethylene (hormone)

    Ethylene regulates fruit ripening in plants.

  • Abscisic acid (hormone)

    Abscisic acid controls stress responses and dormancy in plants.

  • Gibberellins (hormone)

    Gibberellins promote stem growth and seed germination.

  • Phototropism

    Phototropism is directional growth in response to light.

  • Gravitropism

    Gravitropism is directional growth in response to gravity.

  • Hydrotropism

    Hydrotropism is directional growth in response to water.

  • Thigmotropism

    Thigmotropism is directional growth in response to touch, such as roots bumping or vines attaching.

  • Tropism movement speed

    Tropisms involve directional growth with slow movement due to actual cell growth.

  • Auxin and Cytokinin roles in growth

    Auxins and cytokinins can both promote and inhibit plant growth.

  • Nastic movements

    Nastic movements are plant responses to stimuli without directional growth, caused by changes in water pressure, and are fast.

  • Examples of nastic movements

    Examples include carnivorous plant traps and leaf folding in response to touch or vibrations.

  • Heliotropism

    Heliotropism is the solar tracking movement of leaves or flowers to follow the sun for pollination or light capture.

  • Difference between tropisms and nastic movements

    Tropisms are directional growth responses with slow movement; nastic movements are non-directional, fast responses due to water pressure changes.

  • Thigmotropism example

    An example of thigmotropism is vines wrapping around a support after touching it.

  • Gravitropism example

    Roots growing downward due to gravity is an example of gravitropism.

  • Phototropism example

    Plant stems bending toward light is an example of phototropism.

  • Hydrotropism example

    Roots growing toward moisture is an example of hydrotropism.

  • Mechanism of nastic movements

    Nastic movements occur by rapid changes in turgor pressure within plant cells.