The following text discusses circadian rhythms.
Human biology follows approximately 24-hour cycles synchronized to light exposure. Blue light from screens suppresses melatonin production, potentially disrupting sleep patterns. Shift workers, exposed to artificial lighting when their bodies expect darkness, show elevated rates of metabolic disorders. Understanding these mechanisms has led to "night mode" features in devices and lighting recommendations for night-shift environments.
Which choice best describes the overall structure of the text?
It explains a biological process, identifies disruptions, and notes applications.
It argues that all screen use should be eliminated after sunset.
It compares sleep patterns across different cultures.
It traces the historical discovery of circadian rhythms.
Correct Answer: A
Choice A is the best answer. The text explains circadian rhythms, identifies disruptions (screens, shift work), and notes applications (night mode, lighting recommendations).
- Evidence: The text explains the process: "24-hour cycles synchronized to light." It identifies disruptions: "Blue light," "Shift workers." It notes applications: "night mode," "lighting recommendations."
- Reasoning: The structure is Process -> Problem -> Solution/Application.
- Conclusion: This matches "explains a biological process, identifies disruptions, and notes applications."
💡 Strategy: Track the logical flow: How it works -> What breaks it -> How we fix it.
Choice B is incorrect because elimination isn't advocated. Choice C is incorrect because cultures aren't compared. Choice D is incorrect because discovery history isn't traced.