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Plant Hormones Science Fair Project

Exploring Plant Hormones

Exploring Plant Hormones | Science Fair Projects | STEM Projects
Ever wondered how plants grow? In this project, you'll explore the role of two hormones, auxin and cytokinin, in plant growth. You'll observe how these hormones affect the development of roots and buds in plants.


The hypothesis is that auxin and cytokinin affect the development of roots and buds in plants.

Method & Materials

You will cut off the inferior part of a plant, including the roots, and observe the development of adventitious roots in a medium with or without auxin. You will also replace the apical bud with cotton impregnated with auxin and observe the development of axillary buds in lateral branches. Finally, you will put a geranium leaf on some soil or on a synthetic medium with or without cytokinin and observe the development of adventitious buds.
You will need a plant, a medium with or without auxin or cytokinin, cotton, and a geranium leaf.


The results showed that without auxin, roots developed, while with auxin, no axillary bud development was observed. With cytokinins, more buds were observed. This suggests that auxin is produced in the apical part of the plant and prevents the development of axillary buds, while cytokinins are produced in the roots and prevent the development of roots.

Why do this project?

This science project is interesting because it allows students to explore the role of hormones in plant growth.

Also Consider

Variations to consider include testing other hormones, such as gibberellins, and testing the effects of different concentrations of hormones.

Full project details

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

Related videos

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!!
See the detailed steps in an apical dominance experiment with auxin in this video tutorial!
A quick comprehensive video on the different plant hormones, including auxin and cytokinin.
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