Name:_________________________ Class:___________ Date:___________
Bubblicious!
Purpose: How does plant behavior change in different light situations and does
the light change the rate of photosynthesis?
Research and Background:
Hypothesis:
Materials:
2 clear cups or test tubes
2 sprigs of Elodea
baking soda
small scooper
data table
watch or timer
Procedure:
1. Fill each cup or tube 3/4 full of water. Add one small scoop (about
half a spoon) of baking soda to the water. Stir to dissolve.
2. Take one sprig of elodea, gently pull off the leaves close to the cut stem end.
LIGHTLY crush the stem end. Place into water with the stem end UP.
3. Starting in the room, count the bubbles that you see forming immediately.
Record this as your initial reading.
4. Continue recording at 30 second intervals for five minutes.
5. Take the second cup of water and baking soda, prepare the elodea the same way
you did for step 2.
6. Count the bubbles you see forming as the initial reading.
7. Take the cup into the full sun and repeat step 4, recording data for five
minutes.
Time in minutes
Initial
1
2
3
4
5
Number of bubbles in
Classroom/ no direct sun
Number of bubbles in
direct sunlight
Graph:
Create a line graph with a title and key for this investigation.
Results: (What did you notice?)
Conclusion:
Questions and Discussion:
Choose any five questions from the grid. Answer them on your own paper and attach to the lab
sheet.