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Difficulty: EasyOverall Text Structure Analysis

In modern agricultural science, cover crops are often planted to prevent soil erosion during the winter off-season. Some researchers have suggested that these crops also actively enrich the soil microbiome. To test this hypothesis, agricultural scientist Dr. Helena Lin monitored soil microbial diversity in experimental fields planted with clover cover crops versus unplanted fallow fields. Lin observed a significant increase in beneficial bacterial populations in the clover-planted soil. She concluded that cover crops do indeed enhance the microbiome, thereby improving soil health for subsequent cash crops.

Which choice best describes the overall structure of the text?

  1. A
    It describes a common agricultural practice, identifies a drawback associated with that practice, and proposes an alternative method to minimize the drawback.
  2. It introduces a common agricultural practice, presents a hypothesis about an additional benefit of that practice, describes an experiment designed to test this hypothesis, and summarizes the experiment's findings.Answer
  3. C
    It presents a theory about soil health, outlines a study that disproved the theory, and discusses the implications of this refutation for agricultural science.
  4. D
    It introduces a biological concept, explains the historical origin of that concept, and compares its relevance across two different scientific disciplines.

Answer

The text introduces a common agricultural practice, presents a hypothesis about an additional benefit of that practice, describes an experiment designed to test this hypothesis, and summarizes the experiment's findings.
The correct answer accurately outlines the logical progression of the passage. The text starts by presenting a common agricultural practice (using cover crops to prevent erosion), shifts to a hypothesis about an extra benefit (enriching the microbiome), describes an experiment designed to test this hypothesis (monitoring clover-planted vs. fallow fields), and concludes with the findings that confirm this benefit.

Step-by-Step Solution

1
Identify the function of the first sentence.
The first sentence introduces the practice of planting cover crops during the off-season to prevent erosion.
This establishes the subject and standard practice.
2
Analyze the transition to the second sentence.
The second sentence introduces the idea (hypothesis) that cover crops might also enrich the soil microbiome.
This suggests a secondary benefit beyond simple erosion control.
3
Determine the role of the third and fourth sentences.
These sentences describe Dr. Lin's experiment comparing clover-planted and fallow fields and the resulting increase in bacteria.
This details the test of the hypothesis and its immediate results.
4
Evaluate the final sentence.
The final sentence states Lin's conclusion that cover crops do enhance the microbiome and improve soil health.
This wraps up the passage by confirming the hypothesis based on the findings.

Key Concept

Overall Text Structure Analysis
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Overall Text Structure Analysis

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