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Nutrition Science Fair Project

Green Tea and Daphnia

Green Tea and Daphnia | Science Fair Projects | STEM Projects
In this science project, you'll explore the effects of green tea and Altace on the heart rate of daphnia. You'll measure the heart rate of the daphnia before and after adding the solutions, and compare the results.


The hypothesis is that herbal green tea is able to reduce the heart beat of daphnia.

Method & Materials

You will prepare 7 beakers with different concentrations of green tea and Altace solution, and place 20 daphnia specimens on each of 8 slides. You will then add 3 drops of each solution to the slides and count the heartbeats per minute of the daphnia under a microscope.
You will need 160 daphnia, 7 beakers, a packet of green tea powder, a tablet of Altace, a microscope, 7 glass slides, a digital weighing scale, a stopwatch, 700ml distilled water, a measurement cylinder, an eyedropper, and an assistant.


The results showed that adding green tea and Altace solution reduced the heartbeat of the daphnia. The higher concentration of the solution resulted in a slower heartbeat per minute. The green tea was also able to reduce the heartbeat rate more than the Altace solution of the same concentration.

Why do this project?

This science project is interesting because it explores the effects of green tea and Altace on the heart rate of daphnia, and provides insight into the healing properties of green tea.

Also Consider

Experiment variations to consider include using different types of herbs like garlic or ginger, and adjusting the room temperature.

Full project details

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

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