In the presence of acid, phenol red turns yellow. As the pH rises (becomes alkaline), the solution returns to red. Based on this explanation, the uptake of CO2 by a plant in distilled water containing CO2 and a drop of phenol red would cause the water solution to Multiple Choice turn clear. turn pink. turn opaque.
Added by Jose Carlos A.
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The plant takes in CO2 for photosynthesis. Show more…
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