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Photosynthesis
Investigation 2
Investigation 2
Photosynthesis
Phase 1 – Defined Understanding
Student Guide
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Student Guide with answers
Teacher PreLab
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Phase 2 – Dynamic Understanding
► Investigation Two Summary – Lab Goals
In Investigation Two, you explored the effect of light on the process of photosynthesis. You also analyzed the relationship between light and carbon dioxide and oxygen levels. During this Investigation, you:
1. Tested carbon dioxide levels by exposing light to an elodea plant in one test tube of 25ml water and a pH indicator, phenol red. These results were compared to a control test tube exposed to the same light and containing phenol red but no elodea plant.
2. Used an Oxygen Probe to measure oxygen levels in a beaker containing water and elodea plant and compared it to a control beaker filled with water but no elodea plant. Both beakers were exposed to light.
► Investigation Two Summary – Learning Goals
Through these experiments, you concluded that:
1. Light is necessary for photosynthesis. In the presence of light, carbon dioxide levels decreased in water containing Elodea but not in water alone. This indicates that carbon dioxide is used in the process of photosynthesis.
2. Light is necessary for photosynthesis. In the presence of light, oxygen levels increased in water containing Elodea but not in water alone. This indicates that oxygen is a product of photosynthesis.
Concept Slides
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Mathematics Concepts in This Investigation
- analyzing chemical formulas
- volume in mL
- counting whole numbers
- greater than/less than/equal to
- predict/verify results
- length in cm
- data table
- data analysis
- time in seconds and minutes
- measuring oxygen level using oxygen meter (mg/L)
- decimals to nearest tenth
- line graph
- skip counting by 0.5 and 5
- (in)direct relationships
- patterns/trends
- greater than/less than/equal to
- comparing values/measurable characteristics