NR 215 Plant Biology Lecture 6: Leaves Outline Quiz
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Questions and Answers

What characteristic makes a leaf different from other green plant parts exposed to the sun?

  • They lack glucose/starch storage tissues.
  • They continue to grow like a shoot and produce buds.
  • They have an epidermis but lack stomata.
  • They are lateral appendages of a stem specialized for photosynthesis. (correct)
  • What structures in bald cypress trees are believed to aid gas exchange?

  • Rachis
  • Aerenchyma
  • Phyllotaxy
  • Pneumatophores (correct)
  • Which structure of a leaf is responsible for the network of vascular tissue?

  • Epidermis
  • Lamina
  • Petiole
  • Veins (correct)
  • Which of the following is NOT a main leaf arrangement category?

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

    In compound leaves, how is the blade divided?

    <p>Into leaflets</p> Signup and view all the answers

    What term is used for leaves that are replaced each year?

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

    What is the term for the extension of the petiole in compound leaf arrangements?

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

    Which plant species mentioned in the text is an example of a deciduous gymnosperm?

    <p>Bald cypress</p> Signup and view all the answers

    What does the lamina refer to in leaf anatomy?

    <p>Blade of the leaf</p> Signup and view all the answers

    What type of leaves have a single blade per petiole and an axillary bud at the base of each leaf?

    <p>Simple leaves</p> Signup and view all the answers

    What is the primary function of the epidermis in a leaf?

    <p>Protection and regulation of gas exchange</p> Signup and view all the answers

    Which leaf arrangement type has the leaflets arranged along the rachis?

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

    What separates the mesophyll from the vascular tissue in Gymnosperm leaves?

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

    What is the role of the endodermis in Gymnosperm needles?

    <p>Separates ice-containing central tissue from ice-free mesophyll</p> Signup and view all the answers

    How does the endodermis impact needle freezing behavior in conifer leaves?

    <p>It helps manage ice localization</p> Signup and view all the answers

    What is the significance of the endodermis in mountain pine needles during freezing?

    <p>Determines frost resistance</p> Signup and view all the answers

    Which cellular structure is separated by the endodermis in Gymnosperm leaves?

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

    How does the presence of an endodermis impact ice management in conifer needles?

    <p>Facilitates discrimination between ice-containing and ice-free tissues</p> Signup and view all the answers

    What is the main function of stomata on a leaf?

    <p>Regulate gas exchange</p> Signup and view all the answers

    What is the specialized function of guard cells on a leaf?

    <p>Regulate stomatal opening and closing</p> Signup and view all the answers

    What happens to up to 99% of water absorbed by a plant?

    <p>Is 'lost' through transpiration</p> Signup and view all the answers

    What theory explains the movement of water from roots to leaves in plants?

    <p>Cohesion-Tension Theory</p> Signup and view all the answers

    Besides gas exchange regulation, what other role does transpiration play in plants?

    <p>Cools plants and facilitates nutrient transport</p> Signup and view all the answers

    What is the primary function of stomata during photosynthesis?

    <p>Allow entry of CO2 and release of O2</p> Signup and view all the answers

    What was the consequence of ice confinement to the central vascular cylinder in frozen needles?

    <p>Mesophyll cells remained photosynthetically active.</p> Signup and view all the answers

    How does the specific lignification patterning of cell walls help in mountain pine needles?

    <p>It impedes freeze-dehydration and enables gas exchange of frozen needles.</p> Signup and view all the answers

    What is the role of the hypodermis in gymnosperm leaves?

    <p>It is a layer of sclerenchyma cells beneath the epidermis that supports leaves.</p> Signup and view all the answers

    How does the lignification of endodermal cell walls affect freezing response?

    <p>It contributes to ice confinement in the central vascular cylinder.</p> Signup and view all the answers

    What is the primary function of the microchemistry of cell walls investigated by Raman microscopy?

    <p>To relate the freezing response to the structure of cell walls.</p> Signup and view all the answers

    Why is the elaborate needle freezing pattern at the treeline considered ecologically important?

    <p>It enables gas exchange in frozen needles, crucial in freezing environments.</p> Signup and view all the answers

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