In the Late 19th Century, Scientists Performed an Experiment in Which

question 99

Multiple Choice

In the late 19th century, scientists performed an experiment in which a tree's roots were removed and the tree was placed in a vat of poison.The scientists were trying to test the hypothesis that roots were somehow responsible for pumping water through the tree to the roots.What did they discover?

• A) Nothing happened, indicating that roots do indeed pump water.
• B) Poison flowed through the tree but at a very slow rate, indicating that roots are responsible for a portion of the flow of water.
• C) Poison flowed through the tree until it killed the leaves, then stopped, indicating that leaves are critical to the flow of water.
• D) Poison flowed until it reached the xylem, then stopped, indicating that xylem effectively pumps water through the tree.
• E) Poison flowed until it reached the apoplast, indicating that the apoplast is largely responsible for the movement of water through the tree.

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Non-institutionalized Population

Individuals residing within a community rather than in institutions such as prisons, nursing homes, or psychiatric hospitals.

Labor Force

The total number of people who are eligible and available to work, including both the employed and the unemployed seeking employment.

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A form of unemployment that occurs when people are between jobs or are entering the workforce for the first time.

Unemployment Rate

The volume of the labor force that is jobless yet engaged in the act of looking for work.