Question 79·Medium·Text Structure and Purpose
Every winter, volunteers armed with notebooks fan out across neighborhoods for the Community Bird Count. Some skeptics dismiss these efforts as too imprecise to matter, yet researchers rely on the counts to track migration patterns, monitor disease outbreaks, and assess the effects of urban development. Because the project spans decades and thousands of sites, individual mistakes tend to cancel out, revealing long-term trends that professional surveys alone would miss. Doubting the value of such participation overlooks what organized, persistent observation makes possible.
Which choice best states the main purpose of the text?
For main-purpose questions, first summarize the passage in one simple sentence: what is the author doing (arguing, describing, instructing, narrating) and about what? Pay special attention to the first and last sentences and to contrast or cause/effect words (like "however," "yet," "because"), which often reveal the author’s goal or attitude. Then eliminate choices that focus on minor details, single examples, or the opposite viewpoint, and pick the option that captures the overall action and focus of the passage, not just a topic word that happens to appear.
Hints
Use the beginning and ending sentences
Reread the first and last sentences. Ask yourself: What activity is being discussed, and what does the author say about people who doubt it at the end?
Pay attention to contrast words
Notice words like "yet," "because," and "overlooks". How do these words show the author pushing back against one viewpoint and supporting another?
Check what the passage mostly does, not just mentions
Ask: Is the passage mainly giving instructions, telling a history, or taking a side in a debate about who can collect useful scientific data?
Step-by-step Explanation
Capture the overall idea of the passage
Read the passage and restate it in your own words.
Here, we learn that:
- Volunteers do a "Community Bird Count" every winter.
- Some people doubt these counts because they think they are too imprecise.
- Researchers do use these counts for serious purposes: tracking migration, disease, and effects of urban development.
- The project covers many years and many sites, so individual mistakes tend to cancel out.
- The last sentence says that doubting the value of this kind of participation overlooks what it makes possible.
This shows the author is responding to criticism and emphasizing what the project achieves.
Focus on structure and contrast words
Look closely at words that signal contrast and cause/effect.
- "Some skeptics dismiss these efforts... yet researchers rely on the counts": this sets up a contrast between doubters and the scientists who actually use the data.
- "Because the project spans decades and thousands of sites, individual mistakes tend to cancel out": this gives a reason the data can still be useful despite being collected by volunteers.
- "Doubting the value of such participation overlooks...": the author is criticizing the skeptics and defending the value of the volunteer work.
So the passage is not neutral; it is making a case in favor of the project.
Turn the author’s stance into a general purpose
Ask: What is the author mainly trying to accomplish, beyond just stating facts?
- The passage does not give step-by-step instructions for how to do the bird count.
- It does not mainly tell a historical story about cities and birds.
- It does not argue that only professionals should collect scientific data; in fact, it supports volunteers.
- Instead, it explains why these volunteer counts matter and why the skeptics are mistaken.
So, in general terms, the author is justifying and supporting the scientific value of the volunteer bird counts.
Match your understanding to the answer choices
Now compare your understanding of the passage’s purpose with each answer choice:
- Choice A: "To explain how to identify common bird species during winter months" — The passage never explains how to identify birds. It is about the usefulness of the counts, not about bird ID tips.
- Choice B: "To describe the history of urban development and its impact on local bird populations" — Urban development is mentioned only briefly as one thing researchers can study. It is a detail, not the main purpose.
- Choice D: "To claim that scientific data collection should be conducted only by trained professionals" — This is the opposite of what the passage says. The passage supports volunteer participation in data collection.
The remaining option, Choice C: "To argue that volunteer bird counts provide reliable, useful data for scientific research," matches the passage’s main goal: defending volunteer bird counts as scientifically valuable despite skepticism. So Choice C is correct.