What Regulates the Flow of Water Through the Xylem

question 7

Multiple Choice

What regulates the flow of water through the xylem?

• A)passive transport by the endodermis
• B)the number of companion cells in the phloem
• C)the evaporation of water from the leaves
• D)active transport by sieve-tube members
• E)active transport by tracheid and vessel elements.

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