Form 10: Comparing Xylem and Phloem Functions
Compare and contrast the distinct functions, directions of transport, and structures of xylem and phloem vessels. Deepen your understanding of plant vascular tissues.
Questions
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MultiChoice
Which option correctly contrasts xylem and phloem transport substances?
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MultiChoice
Xylem tissue consists mainly of dead cells, whereas functional phloem tissue consists of:
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MultiChoice
Wall thickening in xylem cells is made of lignin, whereas cell walls of phloem sieve tubes are made of:
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MultiChoice
Transport in xylem is unidirectionally upward, whereas transport in phloem is:
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MultiChoice
What force primarily drives movement in xylem compared to phloem?
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MultiChoice
Which tissue is located closer to the outer bark in a mature woody dicot stem?
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MultiChoice
What happens when a ring of bark (including phloem) is removed around a tree stem?
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MultiChoice
In a vascular bundle of a young leaf, xylem is typically positioned toward:
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MultiChoice
Which transport tissue uses energy (ATP) directly during the loading process?
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MultiChoice
Which cell type is absent in xylem tissue?
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MultiChoice
Which cell type is absent in phloem tissue?
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MultiChoice
Why does xylem sap contain virtually no sucrose under normal conditions?