GRE RC: Purpose of a Sentence Questions

The following video and the theory that follows give you a quick recap of the Mind Map Approach, explain how to use it for GRE purpose of a sentence questions, and apply it to GRE-style questions with representative answer choices so you gain first-hand experience. Take your time, pause the video to apply the approach yourself, study each explanation carefully, and by the end, develop a clear habit of using the Mind Map Approach for purpose of a sentence questions across your GRE practice quizzes, GRE sectional mocks, and GRE full mocks.

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Understanding the Purpose of a Sentence GRE RC Questions

What do the purpose of a sentence GR ERC questions look like?

A reading comprehension passage may vary in length, from short to medium to long, and includes twists and turns that reflect the character of GRE passages. One specific sentence in the passage is highlighted, and the question stem focuses on identifying the purpose of that highlighted sentence. The question may ask which option best describes the function of the highlighted sentence or what the author is suggesting through that sentence. The answer choices are multiple choice, with five options, and only one answer choice is correct.

Recap of the Mind Map Approach for Solving RC

In a previous lesson, we learned the Mind Map Approach for solving any GRE Reading Comprehension question, and this lesson builds directly on that learning. A part of the Experts’ Global GRE prep online course, the Mind Map Approach has helped tens of thousands of students worldwide since 2008. With proper understanding and steady practice, it helps you approach GRE Reading Comprehension in a methodical way that supports both accuracy and pace.

Summary: Mind-Map Approach (MMA) for attempting all GRE RCs

Before you move forward, take a short and focused refresh of the Mind Map Approach –

Begin by glancing through the first small unit of the passage, which means one meaningful chunk that you can grasp in a single look, without diving into fine detail. Pause and ask yourself what role this unit plays, then capture that role in a brief note. Shift to the next unit, repeat the same reflection, and record another crisp takeaway. As you progress, connect each takeaway with the earlier ones so your understanding grows in a structured and connected way. Continue this rhythm for every new unit until a clear mental map of the passage takes shape. Once this map is ready, turn to the question and filter out incorrect answer choices with a systematic grid based process.

Using the Mind Map Approach for Solving Purpose of a Sentence GRE RC Questions

The Mind Map Approach supports all RC question types. In this lesson, the focus is on applying the Mind Map Approach to “purpose of a sentence” questions. In such questions, a specific sentence in the passage is highlighted, and your task is to select the answer choice that best captures the role that sentence plays in the passage. The mind map you build shows how information flows across the passage, which helps you see the context around the highlighted sentence clearly. As a result, you understand why that sentence appears where it does and what function it serves in moving the passage forward. To solve these questions, you return to the relevant part of the passage, analyze the context a bit deeper, set a broad expectation for the correct answer choice, and then eliminate incorrect answer choices to reach the correct one.

Finding the purpose of a sentence in a passage on GRE RC

GRE-Style Purpose-of-Sentence RC Practice Question

Below is a snapshot of the GRE style Purpose-of-Sentence based Reading Comprehension question discussed in the video, along with the Mind Map approach used to solve it and the Mind Map created for the passage.

GRE RC question

Correct Answer: E

For a detailed explanation of this question, please refer to the video presented earlier on this page.

Following is a step-wise written explanation, using our Mind Map Approach…

Step 1 and 2: First Byte

Byte: “Can we consider Carl Sagan a remarkable scientist? One’s immediate reaction may be to dismiss this question as superfluous.”
- What it did: It raised a question and acknowledged that the answer seems so obvious that the question itself might feel unnecessary.

Step 3 and 4: Subsequent Bytes

Second Byte: “A gifted astronomer… key role… search for extraterrestrial life… widely recognized… advocate for science education.”
- What it did: It developed a case for YES by highlighting his massive public influence and specific scientific achievements.
Third Byte: “However… incongruent with his standing among scientists… unwilling to group him alongside… Ghez or Drake… liaison… rather than specializing.”
- What it did: It developed a case for NO by explaining that within the specialist scientific community, he was seen more as a communicator than a peer to elite researchers.

Step 5: Read the Question

Question: In the highlighted sentence, the author of the passage is most likely…

Step 6: Eliminate

Defending the passage’s main conclusion. (Eliminate: The passage does not reach a single final conclusion; it explores a debate.)
Putting forward an assumption about how Carl Sagan is perceived. (Eliminate: The sentence is about the nature of the question asked, not an assumption about his reputation.)
Asserting that Carl Sagan’s fame has been hyperbolized. (Eliminate: This happens later in the passage, not in the highlighted sentence.)
Undercutting a potential counterargument to the passage. (Eliminate: The sentence actually introduces the topic rather than attacking a counterargument.)
Acknowledging the apparent obviousness of the central issue of the passage. (Keep: This matches the meaning of “superfluous.” The author is saying the question seems like it has an obvious “yes” answer before they dive into the nuance.)