EXERCISE A: 1. When you blow bubbles into the phenol red solution, what gas are you adding?
2. What color was tube #1 (w/Elodea, exposed to light) at the end of the experiment? What does
that tell us about the pH levels? 3. And what does that tell us about the carbon dioxide levels in the
solution? Where did the carbon dioxide go? 4. What was the purpose of tube #3 (no Elodea,
exposed to light)? Explain. 5.What was the color of tube #2 (w/ Elodea, tube covered in aluminum
foil) at the end of the experiment? What does this tell us? In other words, could the Calvin Cycle
occur in the dark? Explain EXERCISE B: 6.What is the purpose of starch in plants? 7. What would
the levels of starch have looked like in the leaf if the plant had been kept in the dark for several
days before the experiment?.
EXERCISE A 1 When you blow bubbles into the phenol red sol.pdf
1. EXERCISE A: 1. When you blow bubbles into the phenol red solution, what gas are you adding?
2. What color was tube #1 (w/Elodea, exposed to light) at the end of the experiment? What does
that tell us about the pH levels? 3. And what does that tell us about the carbon dioxide levels in the
solution? Where did the carbon dioxide go? 4. What was the purpose of tube #3 (no Elodea,
exposed to light)? Explain. 5.What was the color of tube #2 (w/ Elodea, tube covered in aluminum
foil) at the end of the experiment? What does this tell us? In other words, could the Calvin Cycle
occur in the dark? Explain EXERCISE B: 6.What is the purpose of starch in plants? 7. What would
the levels of starch have looked like in the leaf if the plant had been kept in the dark for several
days before the experiment?
