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Difficulty: MediumIdentifying Argumentative Strategies and Methods of Reasoning

Botanist: Agricultural developers claim that introducing a synthetic nitrogen fertilizer will double wheat yield without impairing local soil health, pointing to field trials where soil pH levels remained completely unchanged after application. However, soil health depends primarily on microbial biodiversity rather than acidity alone, and synthetic nitrogen is known to decimate beneficial fungal networks.

Which of the following best describes the method of reasoning used by the botanist?

  1. Challenging a claim by demonstrating that the supporting evidence addresses only a single, insufficient indicator of a broader condition.Answer
  2. B
    Confusing an intermediate premise regarding chemical acidity with the developers' ultimate conclusion about crop yield.
  3. C
    Rejecting a policy proposal by asserting that surface-level similarities between two distinct agricultural trials constitute a flawed analogy.
  4. D
    Overlooking a structural transition in the developers' argument to assert that their findings are entirely ungrounded.
  5. E
    Disregarding an opponent's qualifying statements to claim that the proposed fertilizer has no measurable impact on crop production.

Answer

The botanist's method of reasoning is best described as challenging a claim by demonstrating that the supporting evidence addresses only a single, insufficient indicator of a broader condition.
The botanist refutes the developers' claim by showing that while soil pH remained constant, pH is only one limited aspect of soil health. Because soil health depends heavily on microbial biodiversity—which the fertilizer harms—the developers' evidence is insufficient to prove their broad conclusion.

Step-by-Step Solution

1
Identify the opposing position and its supporting evidence.
The developers claim synthetic nitrogen won't harm soil health, citing trial evidence that soil pH levels were unchanged.
Understanding the target argument's structure is necessary before evaluating how the speaker refutes it.
2
Analyze the speaker's counterargument and evidence.
The botanist points out that soil health requires microbial biodiversity (not just stable pH) and that synthetic nitrogen harms fungal networks.
This establishes that the developers used an overly narrow metric (pH) to represent a complex system (soil health).
3
Match the botanist's argument strategy to the abstract description.
The botanist shows that the evidence (pH stability) measures only one part of a larger condition (soil health), rendering the evidence insufficient.
Abstracting the logical structure isolates the method of reasoning from the specific subject matter.

Key Concept

Identifying Argumentative Strategies and Methods of Reasoning
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Identifying Argumentative Strategies and Methods of Reasoning

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