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Difficulty: EasyDistinguishing Main Point from Subsidiary Points

Historically, conservationists focused primarily on preserving pristine habitats to protect biodiversity. However, recent ecological strategies have shifted toward active restoration, increasingly utilizing "ecosystem engineers" like the North American beaver. By constructing dams, beavers create expansive wetlands that filter pollutants from waterways and provide crucial habitats for amphibians and waterfowl. Furthermore, the slow-moving water behind beaver dams recharges local groundwater tables, making surrounding areas more resilient to droughts. While some landowners consider beavers a nuisance due to localized flooding and felled trees, the net ecological benefits of their activities far outweigh these inconveniences. Ultimately, integrating beavers into conservation planning offers a highly effective, nature-based approach to revitalizing degraded landscapes.

Which one of the following most accurately expresses the main point of the passage?

  1. A
    By constructing dams, beavers create expansive wetlands that filter pollutants and provide essential habitats for various species.
  2. B
    The water retained by beaver dams helps recharge local groundwater tables, which increases the surrounding area's resilience to severe droughts.
  3. C
    Modern ecological restoration now relies exclusively on the deployment of ecosystem engineers to solve the problems of environmental degradation.
  4. Integrating beavers into environmental conservation strategies represents a highly effective, nature-based method for restoring degraded ecosystems.Answer
  5. E
    Conservationists historically focused on preserving pristine habitats primarily because they viewed ecosystem engineers like the North American beaver as a nuisance.

Answer

The correct answer states that integrating beavers into environmental conservation strategies represents a highly effective, nature-based method for restoring degraded ecosystems.
The passage introduces the shift toward active restoration using beavers, details the specific ecological benefits they provide, acknowledges a minor counter-argument, and concludes that their net benefits make them an effective tool for landscape revitalization. The correct option accurately captures this overarching thesis without getting bogged down in the specific mechanisms (like groundwater recharge or pollutant filtration) which serve only as subsidiary evidence.

Step-by-Step Solution

1
Analyze the structure of the passage to identify the author's primary goal.
The passage begins with context (historical conservation), introduces a shift (using beavers for active restoration), provides evidence (filtering water, creating habitat, recharging groundwater), addresses a counterpoint (landowner nuisance), and ends with a concluding synthesis.
Understanding the structural flow helps separate the background and supporting evidence from the central thesis.
2
Locate the overarching conclusion of the argument.
The final sentence ('Ultimately, integrating beavers into conservation planning offers a highly effective... approach') serves as the explicit main point that the rest of the passage is designed to support.
In many argumentative passages, the main point is synthesized at the end after all evidence and counter-arguments have been presented.
3
Evaluate the options against the identified main point, being careful to reject mere supporting facts.
Two options describe the specific benefits of dams (filtering water, recharging groundwater). These are rejected as subsidiary points. One option is overly broad, and another distorts the text. The correct option accurately paraphrases the final sentence.
Distinguishing between a true statement from the passage and the actual main point of the passage is the core skill required for this question.

Key Concept

Distinguishing Main Point from Subsidiary Points
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Topics

Distinguishing Main Point from Subsidiary Points

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