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Photosynthesis Drives Change in Atmospheric CO2

Provided by: Paleontological Research Institution |Published on: June 30, 2022

Activity - Classroom Grades 6-8, 9-12

Synopsis

In this activity, students will collect data on atmospheric carbon dioxide levels for 48 hours using a carbon dioxide sensor, then graph the data to see how the levels vary during different times of the day.
Students will learn about the carbon cycle, photosynthesis, and levels of carbon dioxide in the air.

Related Teaching Resources

Subjects: Chemistry, Biology, Mathematics

Authors: Paleontological Research Institution

Region: Global

Languages: English

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Teaching Materials

Positives

This straightforward activity will show students the important role that plants play in the carbon cycle.
The PDF offers helpful explanations for how photosynthesis affects carbon dioxide levels, as well as an informative diagram of the fast carbon cycle.

Additional Prerequisites

Teachers will need carbon dioxide sensors and graph paper for this activity.
It takes 48 hours to collect the data, so teachers should plan accordingly.
The link for the U.S. Naval Observatory data does not work.

Differentiation

Before the activity, teachers could ask students to discuss the following questions in pairs or small groups:
- What part do plants play in the carbon cycle?
- How do you think photosynthesis affects carbon dioxide levels in the atmosphere?
- Do you think that atmospheric carbon dioxide levels vary at different times of the day? If so, why?
Biology classes could use this experiment to explore the differences between CAM, C3, and C4 plants and discuss what evolutionary benefits each type of plant has that affects the concentration of carbon dioxide in the air surrounding these plants at different times.
As an extension, students could collect data on the carbon dioxide levels in two locations, one with lots of vegetation and another with no vegetation (e.g. a large parking lot) to see if the carbon dioxide levels vary throughout the day in the same way in both locations.
Other resources on this topic include this experiment on the uptake of carbon dioxide in water from plants, this video on the carbon cycle, and this video and demonstration of how much carbon dioxide plants take from the air.

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About the Partner Provider

Paleontological Research Institution

Paleontological Research Institution (PRI) is a national leader in Earth systems science education. They strive to help make sense of the present and potential future climate change, while also increasing understanding of global change in Earth’s past. Their programs focus on systems thinking, understanding scale and learning in your own backyard.