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

What is the characteristic of vessel elements?

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

What is the primary function of xylem?

<p>Transport of water and dissolved nutrients (A)</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 (A)</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 (C)</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 (C)</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 (C)</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 (A)</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 (A)</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 (B)</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 (C)</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 (B)</p> Signup and view all the answers

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

<p>Cohesion-tension theory (B)</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 (C)</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 (B)</p> Signup and view all the answers

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