Water Flows into the Source End of a Sieve Tube

question 33

Multiple Choice

Water flows into the source end of a sieve tube because ________.

• A) sucrose has been actively transported into the sieve tube, making it hypertonic
• B) water pressure outside the sieve tube forces in water
• C) the companion cell of a sieve tube actively pumps in water
• D) sucrose has been transported out of the sieve tube by active transport

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