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Difficulty: HardDecoding Low-Frequency Academic and Technical Words

In environmental science, assessing the health of freshwater ecosystems requires analyzing nutrient levels and biological productivity. While eutrophic bodies of water are characterized by high nutrient concentrations and frequent algal blooms, researchers often contrast them with oligotrophic lakes. These pristine waters, typically deep and cold, exhibit exceptionally low primary productivity and support sparse, specialized fish populations. Understanding how these contrasting aquatic environments respond to human runoff is crucial for developing effective watershed conservation strategies that preserve biodiversity.

As it is used in the passage, the word oligotrophic most nearly means:

  1. A
    naturally deep, cold, and untouched by human activity
  2. B
    composed of a small number of distinct geological layers
  3. characterized by low nutrient levels and low biological productivityAnswer
  4. D
    abundant in diverse aquatic plant life

Answer

characterized by low nutrient levels and low biological productivity
The correct answer is supported by context clues. The passage introduces a contrast using 'While,' showing that oligotrophic lakes are the opposite of eutrophic waters, which have 'high nutrient concentrations.' It further notes that oligotrophic waters exhibit 'exceptionally low primary productivity,' aligning directly with the meaning of being nutrient-poor and low in biological productivity.

Step-by-Step Solution

1
Locate the target word in the text and identify the contrast transition word 'While' which signals an opposite relationship with eutrophic waters.
Recognized that oligotrophic lakes are the opposite of eutrophic lakes.
Establishing the contrast helps determine the word's polarity.
2
Examine the description of eutrophic waters as having 'high nutrient concentrations' to infer the opposite property for oligotrophic lakes.
Inferred that oligotrophic means low in nutrients.
Using contrast context clues helps define the core characteristics of the target word.
3
Corroborate this inference using the subsequent description that these waters exhibit 'exceptionally low primary productivity.'
Confirmed that the term refers to low nutrient levels and low biological productivity.
Validating the definition against local restatement clues ensures context accuracy.

Key Concept

Decoding low-frequency academic and technical words using contrast and explanation context clues.
Estimated Time:1m 30s
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Topics

Decoding Low-Frequency Academic and Technical Words

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