plant hormones
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Questions and Answers

Which external signal is the most important for plants?

  • Soil nutrients
  • Water availability
  • Temperature
  • Light (correct)

    • ______ is the most important external signal perceived by plants.

    Light

    Light is the most reliable external signal to convey information to plants about ______ of year.

    time

    Which hormone is responsible for preventing precocious germination and mediating stomatal closure in drought-stressed plants?

    <p>Abscisic acid</p> Signup and view all the answers

    What is the primary external signal that plants use to convey information about time of year?

    <p>Light</p> Signup and view all the answers

    True or false: Plants do not produce hormones in response to external stimuli.

    <p>False</p> Signup and view all the answers

    What is the most reliable external signal that conveys information to plants about time of year?

    <p>Light</p> Signup and view all the answers

    What is the major plant hormone that promotes stem elongation and apical dominance?

    <p>Auxin</p> Signup and view all the answers

    What do plants use their photoreceptors to detect?

    <p>Both the quality and quantity of light</p> Signup and view all the answers

    The major plant hormone, ______, promotes stem elongation and apical dominance.

    <p>Auxin</p> Signup and view all the answers

    What do plants use photoreceptors for?

    <p>To detect the quality and quantity of light</p> Signup and view all the answers

    True or false: The most important external signal perceived by plants is temperature.

    <p>False</p> Signup and view all the answers

    Temperature can vary substantially from year to year, unlike the predictable nature of the sun's orbit and the quantity of ______.

    <p>light</p> Signup and view all the answers

    Which hormone promotes stem elongation and apical dominance?

    <p>Auxin</p> Signup and view all the answers

    Which part of the plant has blue light receptors that function to detect the direction of light?

    <p>Shoot apical meristems</p> Signup and view all the answers

    Which hormone controls cell division and mobilizes nutrients to sink tissues?

    <p>Cytokinin</p> Signup and view all the answers

    What do cytokinins control in plants?

    <p>Cell division</p> Signup and view all the answers

    True or false: Plant hormones have no effect on physiological processes.

    <p>False</p> Signup and view all the answers

    What is the function of blue light receptors in plants?

    <p>To trigger a response that causes stem bending and opening of stomatal pores</p> Signup and view all the answers

    ______ control cell division and mobilize nutrients to sink tissues.

    <p>Cytokinins</p> Signup and view all the answers

    Plants have evolved photoreceptors to detect both the quality and quantity of ______ to know precisely what time of the day and year it is.

    <p>light</p> Signup and view all the answers

    ______ promote stem elongation, fruit growth, and seed germination.

    <p>Gibberellins</p> Signup and view all the answers

    Which hormone is responsible for leaf abscission and fruit ripening?

    <p>Ethylene</p> Signup and view all the answers

    Which hormone is responsible for leaf abscission and fruit ripening?

    <p>Ethylene</p> Signup and view all the answers

    True or false: Cytokinins promote stem elongation and apical dominance.

    <p>False</p> Signup and view all the answers

    What does the phytochrome pigment detect?

    <p>Red and far-red light</p> Signup and view all the answers

    What does the phytochrome pigment detect?

    <p>Red and far-red light</p> Signup and view all the answers

    Shoot apical meristems and guard cells have blue light receptors that function to detect the direction of light and trigger responses for cell elongation and ______ pore opening.

    <p>stomatal</p> Signup and view all the answers

    What is the role of gibberellins in plants?

    <p>Promote stem elongation and fruit growth</p> Signup and view all the answers

    What is the biologically active form of the phytochrome pigment?

    <p>The Pfr form</p> Signup and view all the answers

    True or false: Gibberellins only promote fruit growth.

    <p>False</p> Signup and view all the answers

    What is the phytochrome?

    <p>A molecular switching machine that switches between two photo-reversible forms</p> Signup and view all the answers

    ______ prevents precocious germination and mediates stomatal closure in drought-stressed plants.

    <p>Abscisic acid</p> Signup and view all the answers

    The phytochrome pigment detects red and far-red light and responds by controlling seed germination, shade avoidance and ______.

    <p>flowering</p> Signup and view all the answers

    What is the result of the interplay of auxin and cytokinin?

    <p>Apical dominance</p> Signup and view all the answers

    ______ is responsible for leaf abscission and fruit ripening.

    <p>Ethylene</p> Signup and view all the answers

    True or false: Abscisic acid promotes precocious germination.

    <p>False</p> Signup and view all the answers

    Plants respond to a wide range of abiotic and biotic stressors, such as drought, flooding, salt, ______, and cold stress.

    <p>heat</p> Signup and view all the answers

    What is photoperiodism?

    <p>The process by which plants control flowering based on the length of day and night</p> Signup and view all the answers

    Which hormone promotes stem elongation, fruit growth, and seed germination?

    <p>Gibberellin</p> Signup and view all the answers

    What is the function of abscisic acid in drought-stressed plants?

    <p>Mediate stomatal closure</p> Signup and view all the answers

    What do plants synthesize in response to excessive heat?

    <p>Heat shock proteins</p> Signup and view all the answers

    True or false: Ethylene is responsible for leaf growth.

    <p>False</p> Signup and view all the answers

    Apical dominance is the result of the interplay of ______ and cytokinin.

    <p>Auxin</p> Signup and view all the answers

    Which external signal is the most important one perceived by plants?

    <p>Light</p> Signup and view all the answers

    How do plants alter the degree of saturation of lipids in the plasma membranes in response to cold temperatures?

    <p>They decrease the degree of saturation</p> Signup and view all the answers

    Plants alter their physiological processes in response to stressors, such as the synthesis of ______ shock proteins in response to excessive heat.

    <p>heat</p> Signup and view all the answers

    Why are plants better suited to responding to external stimuli?

    <p>Due to their anatomical simplicity</p> Signup and view all the answers

    What is the result of the interplay of auxin and cytokinin?

    <p>Apical dominance</p> Signup and view all the answers

    Why are plant responses to changing light conditions crucial?

    <p>To ensure sufficient amounts of light to drive photosynthesis and ultimately sponsor sexual reproduction</p> Signup and view all the answers

    What can be controlled by plant hormones?

    <p>Vegetative propagation</p> Signup and view all the answers

    Plant form and function are important to ensure that a plant gets sufficient amounts of light to drive photosynthesis and ultimately sponsor sexual ______.

    <p>reproduction</p> Signup and view all the answers

    Which organism is better suited to responding to external stimuli, plants or animals?

    <p>Plants</p> Signup and view all the answers

    What process can be controlled by hormones?

    <p>Asexual regeneration</p> Signup and view all the answers

    True or false: Apical dominance is solely controlled by cytokinins.

    <p>False</p> Signup and view all the answers

    Asexual regeneration and vegetative propagation can be controlled by ______.

    <p>Hormones</p> Signup and view all the answers

    Study Notes

    1. Plants produce hormones in response to external stimuli.
    2. Light is the most important external signal perceived by plants.
    3. Plant hormones modify or control physiological processes.
    4. The major plant hormone, auxin, promotes stem elongation and apical dominance.
    5. Cytokinins control cell division and mobilize nutrients to sink tissues.
    6. Gibberellins promote stem elongation, fruit growth, and seed germination.
    7. Abscisic acid prevents precocious germination and mediates stomatal closure in drought-stressed plants.
    8. Ethylene is responsible for leaf abscission and fruit ripening.
    9. Apical dominance is the result of the interplay of auxin and cytokinin.
    10. Asexual regeneration and vegetative propagation can be controlled by hormones.

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