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Difficulty: EasyWords in Context: High-Utility Vocabulary

Many botanists initially believed that the *Mimosa pudica* plant���s rapid leaf-folding behavior was a passive reaction to physical touch. However, subsequent studies have revealed that this response is a highly coordinated defense mechanism that requires significant metabolic energy. Thus, what appears to be a simple reflex is actually a ______ physiological process.

Which choice completes the text with the most logical and precise word or phrase?

  1. complexAnswer
  2. B
    swift
  3. C
    accidental
  4. D
    popular

Answer

complex
The correct answer is 'complex' because the passage contrasts a 'simple reflex' with a physiological process that is 'highly coordinated' and requires 'significant metabolic energy.' The word 'complex' fits this contrast precisely by indicating that the process is sophisticated and multi-faceted, unlike a simple reflex.

Step-by-Step Solution

1
Analyze the context of the blank
The sentence sets up a contrast between what the response 'appears' to be ('a simple reflex') and what it 'actually' is.
This establishes that the correct word must be an antonym or contrast to 'simple' and align with the description of being 'highly coordinated' and energy-consuming.
2
Evaluate the choices against the contrast
The word 'complex' directly contrasts with 'simple' and describes a process that is elaborate and coordinated. Other choices like 'swift,' 'accidental,' and 'popular' do not fit this logical contrast.
Choosing 'complex' completes the contrast in a semantically precise way.

Key Concept

Identifying contextual meaning and logical relationships in a text to select the most precise high-utility vocabulary word.
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Topics

Words in Context: High-Utility Vocabulary

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