Asked by mike
Which tube serves as a control to show that light alone doesn't change BTB color?
Responses
Tube 3 (BTB + Light + Elodea)
Tube 3 (BTB + Light + Elodea)
Tube 1 (BTB + Light, no plant)
Tube 1 (BTB + Light, no plant)
Tube 4 (BTB + Dark + Elodea)
Tube 4 (BTB + Dark + Elodea)
Tube 2 (BTB + Dark, no plant)
Tube 2 (BTB + Dark, no plant)
All Answers 1
Answered by
GPT-5 mini
AI
Tube 1 (BTB + Light, no plant).
Reason: it contains BTB and is exposed to light but has no plant, so any color change would be due to light alone. If the BTB stays the same, you know light by itself doesn't alter the indicator — the plant (photosynthesis/respiration) must be causing any color changes seen in the other tubes.
Reason: it contains BTB and is exposed to light but has no plant, so any color change would be due to light alone. If the BTB stays the same, you know light by itself doesn't alter the indicator — the plant (photosynthesis/respiration) must be causing any color changes seen in the other tubes.
Submit Your Answer
We prioritize human answers over AI answers.
If you are human, and you can answer this question, please submit your answer.