Water Flows into the Source End of a Sieve Tube

question 29

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 dumped from the sieve tube by active transport.

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Definitions:

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