In the experiment below, both test tubes were filled with ye…
In the experiment below, both test tubes were filled with yellow phenol red. Test tube A (left) contained a plant, and test tube B (right) did not. A B After 24 hours, the tubes looked like this: A B [a] Which test tube represents the control in this experiment? [b] What process occurred that made test tube A change color? [c] Was carbon dioxide used, produced, or not changed in tube A? [d] Were these tests tubes placed in the light or dark? [e] Was carbon dioxide used, produced, or not changed in tube B?
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