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:

Critical Thinking

The goal of critically examining and assessing a matter to develop an opinion.

Hypothesis

A proposed explanation made on the basis of limited evidence as a starting point for further investigation.

Correlations

Statistical measures that indicate the extent to which two or more variables fluctuate together.

Cognitive Psychologists

Scientists who study the mental processes underlying perception, thought, learning, memory, and decision-making.