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Botany Science Fair Project

Temperature and Algae Growth

Temperature and Algae Growth | Science Fair Projects | STEM Projects
We're investigating how temperature affects the growth of a certain species of algae. We want to know if the algae grows better in warmer or colder water.


The hypothesis is that the algae will grow better in water at about 20 degrees Celsius.

Method & Materials

You will order algae plants, gather materials, fill containers with water at different temperatures, let the plants grow for 8 days, measure the amount of color in the plants, and filter the plants from the water.
You will need 8 Spirogyra plants, 1 container, 1 thermometer, 1 colorimeter, 4 liters of water, 1 vacuum flask, 6 glass fiber filters, 1 magnetic stir bar, 1 magnetic stirrer, and 1 funnel.


The results showed that the plants growing in water at about 35 degrees Celsius had the most color in them, while the plants that were growing in water at about 25 degrees Celsius had the least color in them. This suggests that all algae plants may grow best in water around 35 degrees.

Why do this project?

This science project is interesting because it can help people who grow and use algae to know how warm or cold the algae should be growing in.

Also Consider

Experiment variations to consider include using distilled water instead of tap water, and trying to keep the water temperature the same.

Full project details

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

Related video

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