Project Summary

Caffeine is a stimulant for the central nervous, respiratory and cardiac system. Caffeine has a positive effect on seedling growth at low concentrations.  So we have decided to use Kangkong (Ipomoea aquatica Torsk) a semi-aquatic tropical plant for our experiment because kangkong is a commercial crop in Southeast Asia.   

Our experiment aims to find out whether caffeine will increase the growth of the kangkong .

We used two setups, one with caffeine, the other without caffeine

Independent Variables: Amount of caffeine

0.5% coffee powder (w/v) was used for one setup, while 0% coffee powder (w/v) was used for another setup as a control.

Dependent Variables: Length of plant

Controlled Variables: Nutrients in nutrient solution, amount of water, location

We performed the two sample T-test to test our data. As p < 0.05, we rejected the null hypothesis, meaning the length of plant grown with caffeine is significantly shorter than the means of the length of plants grown without caffeine. The nutrient solution did not improve the growth of kangkong

Some of the possible reasons to explain our results are that we put too much coffee powder. Another reason is the coffee powder might have other chemical that could harm the kangkong. 

Effect of Caffeine on Ipomoea aquatica Torsk


Project Summary
Fill out the project summary
 and be sure to include your video or presentation.


Judges' Tips An excellent film or presentation will provide a clear, brief overview of the question you are investigating, the stages of your project, what you set out to achieve and how far you succeeded.