The passage is primarily concerned with
discussing the origins of a theory
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.
Consider each of the three choices separately and select all that apply.
Which of the following statements is supported by the passage?
The pull theory originated earlier than did the push theory.
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.
The passage provides information on each of the following except
the mechanism underlying water’s tensile strength
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.