Plant Development Stages 15-16 Quiz
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Questions and Answers

What characterizes stage 15 of Arabidopsis flower development?

  • Cell division in the endocarp ceases
  • The petals and sepals begin to wither
  • The silique shattering process starts
  • The stigma extends above the long anthers (correct)

    • Which feature is observed during stage 16 of Arabidopsis flower development?

  • The silique is twice as long as a stage-13 pistil (correct)
  • Sepals and petals are actively growing
  • Xylem lignification stops in the vascular bundles
  • Cell division in the mesocarp increases

    • What occurs during stage 17 of Arabidopsis flower development?

  • Senescent floral organs abscise from the silique (correct)
  • The lateral vascular bundles expand
  • The inner endocarp cell layer lignifies further
  • The silique begins to yellow from the base to the tip

    • In Arabidopsis flower development, what happens during stage 18?

    <p>The silique begins to dry out as the endocarp disintegrates</p> Signup and view all the answers

    What is suggested to contribute to the silique shattering process in Arabidopsis flower development?

    <p>Lignification of endocarp cell layers</p> Signup and view all the answers

    During which stage of Arabidopsis flower development does the green silique reach its final length?

    <p>Stage 17</p> Signup and view all the answers

    Which gene has been linked to the promotion of lamina outgrowth and expansion in Arabidopsis, maize, and rice?

    <p>AIL/PLT</p> Signup and view all the answers

    Which gene acts as a positive regulator of leaf blade growth in Arabidopsis?

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

    Which factor influences leaf size and shape by repressing plant organ growth?

    <p>Poly(A) polymerases (PAPS)</p> Signup and view all the answers

    What is responsible for the formation of marginal structures resulting from differential growth in adjacent regions?

    <p>Local restriction of growth</p> Signup and view all the answers

    Which gene promotes growth in both layers of the epidermis?

    <p>ANGUSTIFOLIA3 (AN3)</p> Signup and view all the answers

    What is the purpose of the ABC model for floral development?

    <p>To explain the genetic control of flower development</p> Signup and view all the answers

    In stage 20 of Arabidopsis flower development, what happens to the valves of the silique?

    <p>They separate from the silique</p> Signup and view all the answers

    What is the significance of the separation layer in stage 19 of flower development?

    <p>It lacks cell cohesion leading to valve separation</p> Signup and view all the answers

    Which process marks the readiness for seed dispersal in a dehiscent silique?

    <p>Silique shattering</p> Signup and view all the answers

    What does the ABC model for floral development help explain?

    <p>Genetic control of flower development</p> Signup and view all the answers

    How do the valves of a dehiscent silique change from stage 19 to stage 20?

    <p>They separate from the dry silique</p> Signup and view all the answers

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