At the "Source" End of the Phloem, Sugar Loaded into the Phloem

question 169

Multiple Choice

At the "source" end of the phloem, sugar loaded into the phloem draws water into the sieve tubes by osmosis, raising the pressure. What happens to the water at the sink end?

• A)It follows the sugars out of the sieve tubes, via osmosis.
• B)If the sugars are used for growth, the water can become incorporated in newly created or expanded cells.
• C)If the sugars go into storage (polymerized as starch), the water may be drawn back into the xylem.
• D)After sugars leave the sieve tubes, the water diffuses back toward the source region.

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