Water Flows into the Source End of a Sieve Tube

question 46

Multiple Choice

Water flows into the source end of a sieve tube because

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

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