Teacher Portal
Photosynthesis
Investigation 3
Investigation 3
Photosynthesis
Phase 1 – Defined Understanding
Student Guide
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Access Teacher Guide
Student Guide with answers
Teacher PreLab
Prepare for the Experiment
Phase 2 – Dynamic Understanding
► Investigation Three Summary – Lab Goals
In Investigation Three, you continued your exploration of light and photosynthesis. In particular, certain parts of the plant perform the process of photosynthesis. During this Investigation, you:
1. Used an digital dissolved oxygen probe to measure dissolved oxygen levels in two beakers exposed to light. One beaker contained water and elodea plant. The other beaker contained only water.
2. Created three wet mount slides: whole elodea leaf, cross section of an elodea stem, and longitudinal section of an elodea stem. Used the microscope to compare the cellular structures of the elodea’s leaf and stem.
► Investigation Three 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
- measuring oxygen levels using oxygen meter (mg/L)
- length in cm
- time in seconds and minutes
- averages
- data table
- data analysis
- decimals to nearest tenth
- comparing (non)measurable characteristics
- parts/whole
- verifying size, shape, form
- line graph
- (in)direct relationships
- patterns/trends
- skip counting by 0.2 and 5