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Plant Anatomy: Xylem Structure and Function

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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)

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What is the function of xylem parenchyma?

Storage of food and lateral conduction of sap Signup and view all the answers

What is the characteristic of vessel elements?

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

What is the primary function of xylem?

Transport of water and dissolved nutrients Signup and view all the answers

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

Active transport Signup and view all the answers

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

Pressure gradient Signup and view all the answers

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

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

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

It follows the sugars out of the phloem by osmosis Signup and view all the answers

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

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

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

Pressure-Flow Theory Signup and view all the answers

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

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

What is the direction of glucose movement in the phloem?

In all directions, depending on the plant's needs Signup and view all the answers

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

Presence of nuclei and other cellular organelles Signup and view all the answers

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

Cohesion-tension theory 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?

Ascent of sap Signup and view all the answers

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

To regulate stomatal opening by changing guard cell turgor Signup and view all the answers