Gibberellins
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Questions and Answers

Which group of organisms produce many chemical hormones?

  • Both animals and plants
  • Plants
  • Neither animals nor plants
  • Animals (correct)

    • What are plant hormones also known as?

  • Hormone receptors
  • Signaling pathways
  • Chemical messengers
  • Phytohormones (correct)

    • How are the effects of phytohormones modulated?

  • By the activities of other phytohormones
  • Both by environmental and developmental influences and by the activities of other phytohormones (correct)
  • By environmental and developmental influences
  • Neither by environmental and developmental influences nor by the activities of other phytohormones

    • Which hormone influences the time at which a plant flowers?

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

    What effect does the uzu mutant of barley have?

    <p>It makes the plant higher yielding</p> Signup and view all the answers

    Which type of plants have the decision to flower most thoroughly studied?

    <p>Annual plants</p> Signup and view all the answers

    Which enzyme catalyzes the rate-limiting step of ABA synthesis?

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

    How do hormones exert their influence on target cells?

    <p>By binding to receptor proteins</p> Signup and view all the answers

    Which proteins are generally well characterized in hormone transport?

    <p>Proteins involved in auxin transport</p> Signup and view all the answers

    What is the role of protein kinases in hormonal signaling?

    <p>They add phosphate groups to proteins</p> Signup and view all the answers

    Which term is commonly used to describe small chemical messengers in plants?

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

    Which of the following is NOT one of the five classical plant hormones?

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

    What is the role of plant hormones in the plant lifecycle?

    <p>They affect all phases of the plant lifecycle</p> Signup and view all the answers

    How are hormone levels in plants controlled?

    <p>Hormone levels are controlled by their rate of catabolism</p> Signup and view all the answers

    Which hormone promotes lateral organ initiation at the shoot apex?

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

    Which hormone maintains the stem cell population at the root apex?

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

    What is the function of strigolactones in shoot branching control?

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

    What is the effect of the recessive le allele on plant height?

    <p>Causes plants to be short</p> Signup and view all the answers

    Which compound is the most active and well characterized in the family of gibberellins?

    <p>Gibberellic acid (GA3)</p> Signup and view all the answers

    What is the function of gibberellins in plant growth and development?

    <p>All of the above</p> Signup and view all the answers

    Which gene encodes an enzyme in the GA biosynthetic pathway and is responsible for the semidwarf phenotype in rice?

    <p>Reduced height1 gene</p> Signup and view all the answers

    What is the role of brassinosteroids in plant growth and development?

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

    Which of the following is true about auxin?

    <p>Auxin is synthesized from the amino acid Trp</p> Signup and view all the answers

    What was the influence described by Charles Darwin and his son Francis in their book?

    <p>The influence of lateral light on plant bending</p> Signup and view all the answers

    What is the role of auxin distribution in embryonic pattern formation?

    <p>Auxin forms the root stem cell population</p> Signup and view all the answers

    How does auxin regulate gene expression?

    <p>Auxin binds to TIR1 and prevents proteolysis of Aux/IAA proteins</p> Signup and view all the answers

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