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Photosynthesis Science Fair Project

Plant Gas Exchange

Plant Gas Exchange | Science Fair Projects | STEM Projects
Let's explore how plants exchange gases with the atmosphere. We'll coat the top and bottom of leaves with Vaseline and observe the results.


The hypothesis is that the underside of a plant leaf takes in gases.

Method & Materials

You will coat the top and bottom of four leaves from two varieties of plants with a heavy layer of Vaseline and observe the leaves daily for one week.
You will need two varieties of plants, Vaseline, and a camera.


The results showed that three of the four leaves with Vaseline on the underside died, while only one leaf with Vaseline on the top died. This suggests that plant leaves take in gases from the bottom, not the top, of each leaf.

Why do this project?

This science project is interesting because it shows how plants exchange gases with the atmosphere and how the stomata on the underside of the leaves allow gases to move in and out.

Also Consider

Experiment variations to consider include using different types of plants or different types of coatings on the leaves.

Full project details

You can find additional information and details for this science fair project here. Have fun exploring!

Related video

Hey there! Here are some awesome videos about this science project that we think you'll really like. They're not only super fun, but they'll also help you learn more about the science behind the project. So sit back, relax, and get ready to have some fun!!
Stomata allow both gases and moisture to exit the leaf. This is another variation of the experiment designed to determine which side of the leaf has stomata.
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