CH 8: Plant Hormones
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Questions and Answers

What is the main role of gibberellins in plants?

  • Initiate germination
  • Induce leaf drop in autumn
  • Promote seed dormancy
  • Promote flowering and fruit development (correct)

    • Which plant hormone is known as the 'stress hormone'?

  • Auxins
  • Abscisic Acid (ABA) (correct)
  • Gibberellins
  • Cytokinins

    • How do synthetic auxins help in weed control?

  • They induce flowering in crops
  • They promote seed dormancy
  • They cause leaf drop in plants
  • They selectively kill broad-leaved weeds (correct)

    • What is the key function of abscisic acid in relation to seeds?

    <p>Induce seed dormancy</p> Signup and view all the answers

    In geotropism, why do roots grow downward and shoots grow upward?

    <p>Auxins accumulate on the lower side of the plant</p> Signup and view all the answers

    What is the role of plant hormones in weed control?

    <p>Leveraging different sensitivities of plant species to specific hormones</p> Signup and view all the answers

    How do gibberellins contribute to agriculture?

    <p>Promoting fruit development without fertilization</p> Signup and view all the answers

    What effect does ABA have on stomata during drought conditions?

    <p>It induces stomatal closing to reduce water loss</p> Signup and view all the answers

    Why are synthetic auxins applied to broad-leaved weeds?

    <p>To selectively kill weeds without harming grass or crops</p> Signup and view all the answers

    What happens to leaf drop in autumn due to increased ABA levels?

    <p>Leaf drop is initiated by ABA levels</p> Signup and view all the answers

    Which class of plant hormones promotes cell elongation, suppresses lateral bud growth, and regulates fruit development?

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

    Where are auxins primarily produced in plants?

    <p>Stem tips and root tips</p> Signup and view all the answers

    What is the function of gibberellins in plants?

    <p>Stimulate stem elongation, seed germination, and fruit enlargement</p> Signup and view all the answers

    Which plant hormone is responsible for apical dominance by inhibiting lateral bud growth?

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

    What happens to lateral buds when the tip of a plant stem is removed?

    <p>They start growing, leading to bushier plants</p> Signup and view all the answers

    Which growth process is primarily influenced by auxins?

    <p>Phototropism (growth towards light)</p> Signup and view all the answers

    What is the primary function of auxins in plants?

    <p>Facilitating cell elongation</p> Signup and view all the answers

    Which plant growth process is controlled by auxins where they inhibit lateral bud growth?

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

    What is the main effect of removing the tip of a plant stem on lateral buds?

    <p>Lateral buds resume growth</p> Signup and view all the answers

    Which growth process involves plants growing towards light?

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

    What is the primary role of gibberellins in plants?

    <p>Promoting fruit enlargement</p> Signup and view all the answers

    How do auxins contribute to plant growth in relation to root development?

    <p>Facilitate deeper root growth</p> Signup and view all the answers

    What is the effect of auxins on lateral bud growth in terms of plant appearance?

    <p>Promoting bushier growth</p> Signup and view all the answers

    What kind of growth does gibberellins stimulate in plants?

    <p>Seed germination</p> Signup and view all the answers

    How do auxins contribute to apical dominance in plants?

    <p>Inhibit lateral bud growth</p> Signup and view all the answers

    What effect does removing the stem tip have on lateral bud growth?

    <p>Lateral buds grow bushier</p> Signup and view all the answers

    How do gibberellins contribute to agriculture?

    <p>By initiating germination and promoting flowering</p> Signup and view all the answers

    What is the primary function of abscisic acid in relation to seeds?

    <p>Promotes seed dormancy</p> Signup and view all the answers

    In geotropism, why do roots grow downward and shoots grow upward?

    <p>Auxins accumulate on the lower side due to gravity</p> Signup and view all the answers

    How can synthetic auxins selectively kill broad-leaved weeds without harming grass or crops?

    <p>Due to differences in hormone sensitivity</p> Signup and view all the answers

    What effect does ABA have on stomata during drought conditions?

    <p>Causes stomata closure to reduce water loss</p> Signup and view all the answers

    Which plant hormone is known as the 'stress hormone'?

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

    What is the role of plant hormones in weed control?

    <p>'Chemical pruning' of unwanted plants</p> Signup and view all the answers

    What is the key function of gibberellins in relation to seed germination?

    <p>'Break' seed dormancy and initiate germination</p> Signup and view all the answers

    Which plant hormone promotes cell elongation, suppresses lateral bud growth, and regulates fruit development?

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

    'Role of Auxins in Geotropism and Phototropism:' Which statement accurately describes the role of auxins in phototropism?

    <p>'Auxins accumulate on the shaded side, leading plant bending towards light'</p> Signup and view all the answers

    What is the primary function of gibberellins in plants?

    <p>Promotion of cell elongation</p> Signup and view all the answers

    How do auxins contribute to apical dominance in plants?

    <p>By suppressing lateral bud growth</p> Signup and view all the answers

    Where are auxins primarily produced in plants?

    <p>Stem tips</p> Signup and view all the answers

    What happens to lateral buds when the tip of a plant stem is removed?

    <p>They grow vigorously</p> Signup and view all the answers

    Why are synthetic auxins applied to broad-leaved weeds?

    <p>To induce uncontrolled growth</p> Signup and view all the answers

    How do gibberellins contribute to agriculture?

    <p>By stimulating stem elongation</p> Signup and view all the answers

    Which plant hormone plays a crucial role in preparing plants for winter by promoting leaf drop?

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

    What is the primary function of gibberellins in relation to flowering and fruit development?

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

    How do synthetic auxins contribute to weed control in agricultural practices?

    <p>By selectively killing broad-leaved weeds</p> Signup and view all the answers

    In geotropism, why do roots grow downward and shoots grow upward?

    <p>Auxins accumulate on the lower side of the plant</p> Signup and view all the answers

    What is the main role of auxins in phototropism, a growth response to light?

    <p>Causing cells on the shaded side to elongate more</p> Signup and view all the answers

    How do gibberellins contribute to seed germination?

    <p>By breaking seed dormancy and initiating germination</p> Signup and view all the answers

    Which plant hormone is involved in closing stomata during drought conditions to reduce water loss?

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

    'Auxins' play a central role in which plant growth response?

    <p>'Geotropism'</p> Signup and view all the answers

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