Chapter 40.2: Plant Flowering Pathways
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Questions and Answers

What is the primary cue that triggers flowering in the light-dependent pathway?

  • Changes in temperature
  • Changes in water availability
  • Changes in gibberellin levels
  • Changes in the proportion of light to dark (correct)

    • Which type of plants flower when daylight becomes shorter than a critical length?

  • Short-day plants (correct)
  • Obligate plants
  • Long-day plants
  • Day-neutral plants

    • What is the term for the process of requiring a period of chilling before flowering?

  • Vernalization (correct)
  • Photoperiodism
  • Floralization
  • Gibberellinism

    • Which pathway is linked to cold and requires a period of chilling before flowering?

    <p>Temperature-dependent pathway (B)</p> Signup and view all the answers

    What is the effect of decreased levels of gibberellins on flowering in some species?

    <p>Flowering is delayed (A)</p> Signup and view all the answers

    Why do plants use light as a cue to flower?

    <p>To ensure flowering occurs when abiotic conditions are optimal (C)</p> Signup and view all the answers

    What is the purpose of manipulating photoperiod in greenhouses?

    <p>To ensure flowering in poinsettias occurs in time for the winter holidays (D)</p> Signup and view all the answers

    What is the direct effect of gibberellin on the LFY gene?

    <p>It increases the gene expression (C)</p> Signup and view all the answers

    What is the primary characteristic of the Autonomous Pathway?

    <p>It does not depend on external cues except for basic nutrition (B)</p> Signup and view all the answers

    How do floral meristem identity genes regulate flower development?

    <p>They activate floral organ identity genes (D)</p> Signup and view all the answers

    What is the result of a Class A gene mutation?

    <p>Aberrant sepals develop (C)</p> Signup and view all the answers

    What is the role of the ABC model in flower development?

    <p>It determines the identity of floral organs (D)</p> Signup and view all the answers

    How can the determination of flowering be tested?

    <p>By changing the environment and ascertaining whether developmental fate has changed (C)</p> Signup and view all the answers

    What is the balance that regulates when flowering occurs?

    <p>Between floral promoting and inhibiting signals (A)</p> Signup and view all the answers

    What is the primary function of the light-dependent pathway?

    <p>To regulate flowering based on day length (A)</p> Signup and view all the answers

    What is the characteristic of facultative long—or short-day plants?

    <p>Their flowering is affected by day length, but not absolutely (A)</p> Signup and view all the answers

    What is the effect of decreased gibberellin levels on flowering?

    <p>It delays flowering (A)</p> Signup and view all the answers

    What is the purpose of the temperature-dependent pathway?

    <p>To induce flowering after a period of chilling (A)</p> Signup and view all the answers

    What is the advantage of using light as a cue for flowering?

    <p>To ensure flowering during optimal abiotic conditions (A)</p> Signup and view all the answers

    What is the characteristic of obligate long—or short-day plants?

    <p>They have an absolute photoperiodic requirement (D)</p> Signup and view all the answers

    What is the primary difference between the light-dependent pathway and the temperature-dependent pathway?

    <p>One responds to day length, and the other responds to temperature (C)</p> Signup and view all the answers

    What is the primary mechanism by which gibberellin promotes flowering?

    <p>By binding to the promoter of the LFY gene (A)</p> Signup and view all the answers

    What is the consequence of a mutation in Class A genes during flower development?

    <p>Aberrant sepals or petals form (A)</p> Signup and view all the answers

    What is the role of floral meristem identity genes in flower development?

    <p>They activate floral organ identity genes (A)</p> Signup and view all the answers

    How does the balance between floral promoting and inhibiting signals affect flowering?

    <p>It regulates the timing of flowering (B)</p> Signup and view all the answers

    What is the characteristic of the Autonomous Pathway that distinguishes it from other pathways?

    <p>It does not depend on external cues except for basic nutrition (A)</p> Signup and view all the answers

    What is the consequence of disrupting the balance between floral promoting and inhibiting signals?

    <p>Aberrant floral organs form (D)</p> Signup and view all the answers

    What is the relationship between the LFY gene and flowering?

    <p>The LFY gene promotes flowering (C)</p> Signup and view all the answers

    What is the primary function of the photoperiodic requirement in plants?

    <p>To ensure flowering occurs when abiotic conditions are optimal (A)</p> Signup and view all the answers

    What is the primary characteristic of day-neutral plants?

    <p>Flowering occurs when mature regardless of day length (B)</p> Signup and view all the answers

    What is the outcome of reduced gibberellin levels in some plant species?

    <p>Flowering occurs more slowly (B)</p> Signup and view all the answers

    What is the primary difference between obligate and facultative long—or short-day plants?

    <p>The sharpness of the distinction between short and long nights (A)</p> Signup and view all the answers

    What is the primary advantage of the temperature-dependent pathway?

    <p>It allows plants to adapt to cold temperatures (C)</p> Signup and view all the answers

    What is the primary mechanism by which plants regulate flowering in response to day length?

    <p>Changes in the proportion of light to dark (D)</p> Signup and view all the answers

    What is the primary effect of vernalization on flowering?

    <p>It delays flowering in response to cold temperatures (C)</p> Signup and view all the answers

    What is the direct consequence of gibberellin binding to the promoter of the LFY gene?

    <p>Increased expression of the LFY gene (A)</p> Signup and view all the answers

    What is the role of floral meristem identity genes in the ABC model?

    <p>Activating floral organ identity genes (D)</p> Signup and view all the answers

    What is the effect of a mutation in Class B genes during flower development?

    <p>Aberrant stamen development (A)</p> Signup and view all the answers

    What is the primary characteristic of the Autonomous Pathway?

    <p>Independence from external cues except for basic nutrition (C)</p> Signup and view all the answers

    What is the consequence of disrupting the balance between floral promoting and inhibiting signals?

    <p>Flowering is delayed (D)</p> Signup and view all the answers

    What is the relationship between the LFY gene and flowering?

    <p>The LFY gene induces flowering (D)</p> Signup and view all the answers

    What is the outcome of manipulating the environment to test the determination of flowering?

    <p>Developmental fate changes (C)</p> Signup and view all the answers

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