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Stoma density and pollutionFeatured science projectScience project video


The hypothesis that the stomata density of pine tree leaves taken from trees found in locations with a higher concentration of traffic will be lower, is correct.

Heavier traffic flow will result in a higher level of pollution and higher levels of emissions of carbon dioxide. The presence of more carbon dioxide may stimulate plant growth. But the plant will also require more nutrients, sunlight and water for the growth to be accelerated. Unless these resources are readily available, the plant will need less stoma.

Also consider

Try to repeat this science fair project by taking leaf samples from different types of trees.


Plant transpiration -

Stoma -

Carbon dioxide and plant response -

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Complexity level:
Project cost ($):
Time required:
1 hour to prepare, 3 days for observation
Material availability:
Easily obtained. Access to a microscope is required
Safety concerns:

Basic safety requirements