Names:____________________________________________ Period: _______________
How does the presence of Snails and plants in an aquarium affect the levels of CO2?
Explain how carbon dioxide cycles in Aquarium water through snails and elodea
HYPOTHESIS_______________________________________________________________________________
_______________________________________________________________________________________________
EXPERIMENT.
Responding variable : Level of CO2
I will measure the level of CO2 by: ________________________________________________________
_______________________________________________________________________________________________
Manipulated Variable : __________________________________________________________________
My experimental control tube will contain : _____________________________________________
RESULTS and Predictions:
Tube
Contents
Start color
Predicted end Actual end
color
color
1
Green
2
Green
3
Green
4
Green
Tube
Contents
1
2
3
4
Start color
Predicted end Actual end
color
color
Green
Green
Green
Green
CONCLUSION Qs:
What is the relationship between Snails and Elodea?
Why did the color of Bromothymol blue change?
What would you conclude if the color in the experimental control had changed?
Was there CO2 in the water at the beginning of the experiment? __________ Where
did the CO2 go in those tubes that contained Elodea?
Which gas do snails release? __________ Which experimental tubes show this? _________
Why does a healthy aquarium need plants?