Plant Anatomy: Xylem Structure and Function
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Questions and Answers

What is the characteristic of xylem fibers?

  • Living parenchymatous cells
  • Tapered, elongated cells
  • Long, tube-like cells
  • Dead, lignified sclerenchymatous cells (correct)

    • What is the primary function of tracheids in xylem?

  • Transport of water and dissolved minerals (correct)
  • Storage of food
  • Supporting the plant
  • Lateral conduction of sap

    • What is the direction of transport in xylem?

  • Lateral
  • Downward
  • Upward (correct)
  • Random

    • What is the function of xylem parenchyma?

    <p>Storage of food and lateral conduction of sap</p> Signup and view all the answers

    What is the characteristic of vessel elements?

    <p>Long, tube-like cells with thin cell walls</p> Signup and view all the answers

    What is the primary function of xylem?

    <p>Transport of water and dissolved nutrients</p> Signup and view all the answers

    What is the primary mechanism by which sugars are transported into phloem in source cells?

    <p>Active transport</p> Signup and view all the answers

    What is the driving force behind the translocation of sugars from source to sink in the phloem?

    <p>Pressure gradient</p> Signup and view all the answers

    What is the role of water in the translocation of sugars in the phloem?

    <p>Water follows the sugars by osmosis, creating a pressure gradient</p> Signup and view all the answers

    What is the fate of water that enters the phloem in the sink cells?

    <p>It follows the sugars out of the phloem by osmosis</p> Signup and view all the answers

    How does the transpiration stream in the xylem interact with the phloem?

    <p>Water may be taken up by the transpiration stream in the xylem</p> Signup and view all the answers

    What is the name of the theory that describes the transport of sugars in the phloem?

    <p>Pressure-Flow Theory</p> Signup and view all the answers

    What is the primary function of companion cells in phloem tissue?

    <p>To support sieve-tube members and assist in sugar loading</p> Signup and view all the answers

    What is the direction of glucose movement in the phloem?

    <p>In all directions, depending on the plant's needs</p> Signup and view all the answers

    Which of the following is NOT a characteristic of sieve-tube members?

    <p>Presence of nuclei and other cellular organelles</p> Signup and view all the answers

    What is the primary force driving water transport in xylem sap?

    <p>Cohesion-tension theory</p> Signup and view all the answers

    What is the term for the process by which water enters the xylem and moves upward through the plant?

    <p>Ascent of sap</p> Signup and view all the answers

    What is the primary function of potassium ions in stomatal regulation?

    <p>To regulate stomatal opening by changing guard cell turgor</p> Signup and view all the answers

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