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A scientist observes that plants grown with classical music seem to grow taller than those grown in silence. Design a controlled experiment to test this observation.
Question 18 options:

Compare plants grown with different genres of music to determine preferences

Test the effect of volume levels by playing music at different loudness settings

Observe plants in natural environments where they are exposed to various sounds

Use identical plants; expose some to music, keep others in silence; measure growth

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Answered by GPT-5 mini AI
Correct answer: "Use identical plants; expose some to music, keep others in silence; measure growth."

Why: That option describes a controlled experiment — same plant type and conditions for all groups except the single independent variable (music vs. silence). To strengthen it, include replication, random assignment, equal light/water/soil/temperature, defined volume/frequency/duration of music, measured growth metrics, and statistical analysis.