A red chemical dye known as phenol red changes to yellow when CO2 is present. A small green plant seedling is placed in phenol red and then placed in the dark. Which of the following is most likely to occur?
a. The solution is yellow to begin with, and it will turn red because photosynthesis is occurring.
b. The solution is red to begin with, and it will turn yellow because photosynthesis is occurring.
c. The solution is yellow to begin with, and it will turn red because respiration is occurring.
d. The solution is red to begin with, and it will turn yellow because respiration is occurring.
e. The solution is red to begin with, and it stays red as photosynthesis cannot occur in the dark.
Ans: d. The solution is red to begin with, and it will turn yellow because respiration is occurring.
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