Comprehension
A tall tree can transport a hundred gallons of water a day from its roots deep underground to the treetop. Is this movement propelled by pulling the water from above or pushing it from below? The pull mechanism has long been favored by most scientists. First proposed 5 in the late 1800s, the theory relies on a property of water not commonly associated with fluids: its tensile strength. Instead of making a clean break, water evaporating from treetops tugs on the remaining water molecules, with that tug extending from molecule to molecule all the way down to the roots. The tree itself does not 10 actually push or pull; all the energy for lifting water comes from the sun’s evaporative power.
Question: 1

The passage is primarily concerned with

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When analyzing a passage, focus on whether it provides a direct explanation or presents alternative perspectives.
Updated On: Oct 3, 2025
  • refuting a hypothesis advanced by scientists
  • discussing the importance of a phenomenon
  • presenting a possible explanation of a phenomenon
  • contrasting two schools of thought
  • discussing the origins of a theory 
     

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The Correct Option is C

Solution and Explanation

Step 1: The passage explains the mechanism behind how water is transported in a tall tree, focusing on the "pull theory." This is a possible explanation for the phenomenon of how water moves from the roots to the treetops. 
Step 2: The passage does not focus on refuting or contrasting schools of thought, but rather on explaining one theory. 
Step 3: Therefore, the correct answer is (C), as it is presenting a possible explanation for a scientific phenomenon.

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Question: 2

Consider each of the three choices separately and select all that apply. 
Which of the following statements is supported by the passage? 

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Look for direct mentions in the text when choosing answers that involve chronology or general scientific consensus.
Updated On: Oct 3, 2025
  • The pull theory is not universally accepted by scientists.
  • The pull theory depends on one of water’s physical properties.
  • The pull theory originated earlier than did the push theory. 
     

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The Correct Option is A

Solution and Explanation

Step 1: The passage mentions that the pull theory is a widely favored explanation, but it does not indicate unanimous agreement. This supports (A). 
Step 2: The passage discusses the tensile strength of water, which is a physical property, in relation to the pull theory. This supports (B). 
Step 3: However, (C) is not directly supported because the passage does not specify that the pull theory originated earlier than the push theory. 

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Question: 3

The passage provides information on each of the following except

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When analyzing a passage, focus on details that directly address the question. In this case, the passage discusses the role of properties but not the mechanism of water's tensile strength itself.
Updated On: Oct 3, 2025
  • when the pull theory originated
  • the amount of water a tall tree can transport
  • the significance of water’s tensile strength in the pull theory
  • the role of the sun in the pull theory
  • the mechanism underlying water’s tensile strength 
     

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The Correct Option is

Solution and Explanation

Step 1: The passage discusses the role of water’s tensile strength in the pull theory and mentions the role of the sun in the process of lifting water. 
Step 2: However, it does not provide an explanation of the actual mechanism underlying water’s tensile strength. Thus, (E) is the correct answer. 

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