18 Questions
What is the characteristic of xylem fibers?
Dead, lignified sclerenchymatous cells
What is the primary function of tracheids in xylem?
Transport of water and dissolved minerals
What is the direction of transport in xylem?
Upward
What is the function of xylem parenchyma?
Storage of food and lateral conduction of sap
What is the characteristic of vessel elements?
Long, tube-like cells with thin cell walls
What is the primary function of xylem?
Transport of water and dissolved nutrients
What is the primary mechanism by which sugars are transported into phloem in source cells?
Active transport
What is the driving force behind the translocation of sugars from source to sink in the phloem?
Pressure gradient
What is the role of water in the translocation of sugars in the phloem?
Water follows the sugars by osmosis, creating a pressure gradient
What is the fate of water that enters the phloem in the sink cells?
It follows the sugars out of the phloem by osmosis
How does the transpiration stream in the xylem interact with the phloem?
Water may be taken up by the transpiration stream in the xylem
What is the name of the theory that describes the transport of sugars in the phloem?
Pressure-Flow Theory
What is the primary function of companion cells in phloem tissue?
To support sieve-tube members and assist in sugar loading
What is the direction of glucose movement in the phloem?
In all directions, depending on the plant's needs
Which of the following is NOT a characteristic of sieve-tube members?
Presence of nuclei and other cellular organelles
What is the primary force driving water transport in xylem sap?
Cohesion-tension theory
What is the term for the process by which water enters the xylem and moves upward through the plant?
Ascent of sap
What is the primary function of potassium ions in stomatal regulation?
To regulate stomatal opening by changing guard cell turgor
Test your knowledge of the xylem tissue in plants, including its composition, location, and role in transporting water and nutrients. Learn about the characteristics of tracheids, vessels, and xylem fibers.
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