STU1043 Introduction to Plant Physiology LU6: Plant Growth Regulators Quiz
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STU1043 Introduction to Plant Physiology LU6: Plant Growth Regulators Quiz

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Questions and Answers

Which of the following is NOT an example of a plant growth regulator?

  • Auxin
  • Nitrogen (correct)
  • Ethylene
  • Phenolics

    • What are the triggering substances recognized as plant growth regulators?

  • Auxins, Cytokinins, Gibberellins, and Phenolics (correct)
  • Gibberellins, Phenolics, and Ethylene
  • Auxins, Cytokinins, and Phenolics
  • Cytokinins, Gibberellins, and Ethylene

    • Which group of compounds contain nitrogen among the plant growth regulators?

  • Phenolics and Auxin
  • Gibberellins and Ethylene
  • Auxin and Cytokinin (correct)
  • Cytokinin and Gibberellins

    • How do environmental factors interact with phytohormones during plant growth?

    <p>They interact with phytohormones during growth and differentiation</p> Signup and view all the answers

    What are plant growth regulators known as when they modify physiological processes in plants?

    <p>Bio-stimulants or bioinhibitors</p> Signup and view all the answers

    Which of the following statements about Abscisic Acid is TRUE?

    <p>It is composed of nitrogen, carbon, and oxygen</p> Signup and view all the answers

    What are growth regulators in plants primarily responsible for?

    <p>Stimulating or inhibiting specific enzyme systems to regulate plant metabolism</p> Signup and view all the answers

    How do hormones in plants produce a characteristic physiological response?

    <p>They are transported to another part of the plant and then synthesized</p> Signup and view all the answers

    What effect does auxin have on cell division?

    <p>It stimulates cell division</p> Signup and view all the answers

    In what process does auxin play a role in plant propagation?

    <p>Root initiation on stem cuttings</p> Signup and view all the answers

    What is the primary role of auxin in vascular tissue differentiation?

    <p>It influences the differentiation of vascular tissue in the elongating shoot</p> Signup and view all the answers

    How does auxin contribute to cambium growth in woody plants?

    <p>It stimulates cell division in cambium cells</p> Signup and view all the answers

    What is the effect of applying a large quantity of auxin to already growing roots?

    <p>It inhibits the growth of the roots</p> Signup and view all the answers

    How does auxin contribute to fruit growth in plants?

    <p>By promoting the growth of fruit</p> Signup and view all the answers

    What is the primary purpose of maleic hydrazide, a common growth regulator?

    <p>Inhibiting specific enzyme systems to regulate plant metabolism</p> Signup and view all the answers

    How do hormones primarily affect plant cells and metabolism?

    <p>By stimulating or inhibiting specific enzyme systems to regulate plant metabolism</p> Signup and view all the answers

    Which of the following is composed of nitrogen among the recognized plant growth regulators?

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

    What is the primary role of bio-stimulants or bioinhibitors, known as Plant Growth Regulators (PGR), in agriculture?

    <p>Modify physiological processes in plants</p> Signup and view all the answers

    What are the triggering substances recognized as plant growth regulators?

    <p>Auxins, Cytokinins, Gibberellins, Phenolics (Ethylene)</p> Signup and view all the answers

    How do environmental factors interact with phytohormones during plant growth?

    <p>They interact with phytohormones and biochemical processes during growth and differentiation</p> Signup and view all the answers

    Which of the following is NOT composed of nitrogen among the recognized plant growth regulators?

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

    In what process do Auxin and cytokinin play a role according to the text?

    <p>(Auxin) Shoot formation; (Cytokinin) Leaf formation</p> Signup and view all the answers

    Which of the following statements about gibberellins is FALSE?

    <p>They promote the growth of fruit.</p> Signup and view all the answers

    What is the primary role of cytokinin in plant growth?

    <p>Stimulating cell division</p> Signup and view all the answers

    How does abscisic acid primarily affect plant physiology?

    <p>By inducing dormancy in buds and seeds</p> Signup and view all the answers

    What effect does ethylene have on plant growth?

    <p>It inhibits leaf abscission.</p> Signup and view all the answers

    What is the primary function of auxin in vascular tissue differentiation?

    <p>It influences the differentiation of vascular tissue in the elongating shoot.</p> Signup and view all the answers

    Which statement about plant hormones is TRUE?

    <p>They are synthesized by cells in one part of the plant and transported to another part to produce a physiological response.</p> Signup and view all the answers

    Which of the following is NOT a physiological effect of auxin in plants?

    <p>Inhibiting cambium growth in woody plants</p> Signup and view all the answers

    How do plant hormones primarily cause a variety of effects in plants?

    <p>By being transported from one part of the plant to another</p> Signup and view all the answers

    What does auxin promote in woody plants?

    <p>Growth of cambium</p> Signup and view all the answers

    Which statement about plant growth regulators is TRUE?

    <p>They can regulate plant metabolism at very minute quantities.</p> Signup and view all the answers

    Study Notes

    Plant Growth Regulators

    • Plant growth regulators are substances that modify physiological processes in plants.

    Types of Plant Growth Regulators

    • Plant growth regulators can be classified into five main categories: auxins, gibberellins, cytokinins, ethylene, and abscisic acid.
    • Auxins are involved in cell elongation, cell division, and differentiation.
    • Gibberellins are involved in stem elongation and seed germination.
    • Cytokinins are involved in cell division and shoot formation.
    • Ethylene is involved in fruit ripening and senescence.
    • Abscisic acid is involved in seed dormancy and stress responses.

    Characteristics of Plant Growth Regulators

    • Plant growth regulators can be composed of nitrogen.
    • Maleic hydrazide is a common growth regulator used to promote fruit growth.

    Role of Plant Growth Regulators in Plant Growth

    • Plant growth regulators play a crucial role in plant development, growth, and response to environmental stimuli.
    • Plant growth regulators interact with environmental factors to regulate plant growth.

    Functions of Specific Plant Growth Regulators

    • Auxin promotes cell division, cell elongation, and differentiation in plants.
    • Auxin plays a role in plant propagation, vascular tissue differentiation, and cambium growth in woody plants.
    • Auxin can stimulate root growth when applied in small quantities.
    • High concentrations of auxin can inhibit root growth.
    • Cytokinin promotes cell division and shoot formation in plants.
    • Gibberellins promote stem elongation and seed germination in plants.
    • Ethylene promotes fruit ripening and senescence in plants.
    • Abscisic acid promotes seed dormancy and stress responses in plants.

    Importance of Plant Growth Regulators in Agriculture

    • Plant growth regulators are used in agriculture to modify physiological processes in plants, promoting optimal growth and yield.
    • Bio-stimulants or bioinhibitors, known as Plant Growth Regulators (PGR), are used to improve agricultural productivity.

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    Description

    Test your knowledge on plant growth regulators in this quiz focused on the roles, functions, and uses of plant hormones such as Auxin, Gibberellins, Cytokinins, Abscisic Acid, and Ethylene in agriculture.

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