Ex. 6
Cellular Respiration and
Photosynthesis Lab
What is ahead?
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Procedure 1. Relationship of photosynthesis to chlorophyll
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Procedure 3. Relationship of Photosynthesis rate to carbon dioxide
concentration
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Procedure 5. . Effect of Temperature and food source on yeast
fermentation
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Procedure 6. Aerobic respiration of peas
1
P1. Relationship of Photosynthesis to Chlorophyll
Is there a correlation between the green are and
the area stained by the iodine?
P1. Relationship of Photosynthesis rate to
Carbon Dioxide Concentration
Elodea plants live in freshwater
When elodea is photosynthesizing,
What does it consume from the surrounding liquid?
What does it produce into the surrounding liquid?
How can we detect if the elodea is photosynthesizing?
2
P5. The effect of temperature and food source on
yeast fermentation
Reaction of Anaerobic Respiration (aka Fermentation):
Yeast are unicellular fungi that obtain energy
by consuming glucose in flour or fruit juice
in absence of oxygen via anaerobic respiration
What will the yeast consume from the solution?
What will the yeast produce into the solution?
How can we detect if yeast are respiring?
P6. Aerobic respiration in peas
Reaction of Aerobic Respiration:
Peas: embryo plants (alive) + nutrients
Embryo extracts energy from nutrients
via aerobic respiration
What will the peas consume from the surrounding solution?
What will the peas produce into the surrounding solution?
How can we detect if peas carrying out aerobic respiration?
3
Phenol Red is an indicator of amount of
Carbon Dioxide in a solution
+++CO2 ++CO2
+CO2
If we add CO2 to the phenol red,
what will be the color of “phenol red”?
If we remove CO2 from the phenol,
what will be the color?
Plan of attack
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Groups of four
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Division of work
Pair A
P6. Yeast fermentation (set and wait 30 min)
P1. Leaf iodine test
Pair B:
Phenol Red- Peas (wait 10 min)
Sodium bicarbonate-Elodea (count for 30 min)
• Show experiments to your group members
before cleanup
4