Due Date_____________________
Name _____________________
Date_____________________
Period_____________________
Cellular Respiration and Photosynthesis Virtual Lab
http://www.classzone.com/cz/books/bio_07/resources/htmls/virtual_labs/virtualLabs.html
http://tinyurl.com/3xmf9sw
Click Carbon Transfer through Snails and Elodea
(If you do not go straight to the list of labs, click the state, click high school, click the
biology textbook, click virtual labs. Click GO after each choice.)
Helpful vocab:
Aquarium - a glass box that holds water and fish
Aquatic – lives in water
Conditions – how it is
Elodea – a water plant
Indicator – a chemical that changes color to show if another chemical is there (for
example, BTB changes from blue to green to yellow to show how much CO2 is in the
water. Green = a little bit of CO2, yellow = a lot of CO2)
Investigation – experiment
Maintain – to keep the same
Procedure – steps you will follow
Simulate – to act like
Solution – liquid mixture
1. What is the question (problem) that you are investigating? As you write your
experiment keep this question in mind.
Directions:
Explore the lab by clicking on the different things. You have seen everything when
everything is checked off the checklist. Click procedure when you are ready to continue.
Answer questions about the experiment
2. What is the purpose of the BTB?
3. What does it mean if BTB is blue? _______________________________
4. What does it mean if BTB is green? _______________________________
5. What does it mean if BTB is yellow? _______________________________
6. Which process(es) do plants do in the light? ______________________
7. What gas(es) does that release? ______________________
8. Which process(es) do plants do in the dark? ______________________
9. What gas(es) does that release? ______________________
10. Which process(es) do snails do in the light? ______________________
11. What gas(es) does that release? ______________________
12. Which process(es) do snails do in the dark? ______________________
13. What gas(es) does that release? ______________________
Experimental Design
14. Dependent variable (what you are measuring):
15. Independent variable (what you are changing): (Ex: light/dark; number of snails;
number of elodea; only snails, only elodea and both snails and elodea) You must
have a test tube with elodea AND snails)
16. For your control group, determine what you would set up in order to compare
your experiment to see if there is actually a change. How will you set up your
control group?
Test
Tube
1
Set up and Data:
Contents
Light or
Dark
Starting Predicted
color
End
Color
Green
2
Green
3
Green
4
Green
1
Green
2
Green
3
Green
4
Green
Actual
End
Color
Analysis and Conclusion:
17. What was the relationship between the snails and the elodea?
Conclusion: Write your conclusion in the format claim/evidence/reason. Make sure
your conclusion addresses why you need to add elodea to your snail aquarium.