100 Days of Science #36: Plants Breathe Experiment


We've always heard that plants use water, sunlight, and carbon dioxide to make their food and that they give off oxygen, but we can't really see that oxygen they give off... until now!

We did a super fun and simple science experiment a few weeks ago that allowed us to see all the air bubbles that plants give off as they're making their food.  Granted I can't test it to be sure it's oxygen but thankfully my kids didn't question that.



We picked two leaves; roughly the same size and shape from the same tree.  We needed leaves that would fit flat across the top of our glasses and we had a tree nearby that was just perfect.

We filled our cups with cool water and gently laid our leaves on top.


Then we set one leaf in a dark cabinet (with the door shut!) for a minimum of an hour.


And set the other glass out in a sunny window.  Our day wasn't as sunny as I would have liked for this experiment so when we checked our leaves after an hour and didn't see a huge difference we let them both sit in the dark and light for another hour.


The leaf that was in the sun begins to have air bubbles all around it!


And on the sides of the glass too
The leaf that was in the cabinet has hardly any air bubbles.




We even lifted the glasses up to see underneath the leaves and still noticed that the sunlit leaf had way more air bubbles than the one in the dark cabinet.



The leaf in the cabinet wasn't making nearly as much food without the sunlight and therefor doesn't give off oxygen.

Pretty neat!



Others in this series:

1. Bernoulli's Principle
2. Ecotarium Trip 
3. Air Molecule Experiment
4. Kitchen Science
5. Corn Maze Field Trip 
6. Birds of Florida 
7. Making Static Music
8. Un-Make It Monday
9. Wind Tunnel Experiment
10. Biomes Field Trip
11. Disappearing Coin Trip
12. Snuffing out a Candle With Baking Soda
13. Making Plastic from Milk
14. Friction Experiment 
15. & 16. Snow Experiments
17. Making an Iceberg
18. Floating Eggs
19. Pond Water Under a Microscope 
20. Planting Eco Plant Pals
21. & 22. Cotton Candy Experiments
23. Springfield Science Museum Trip
24. Signs of Spring
25. Color Changing Slime
26. Growing Our Own Tickle Plants
27. Learning About Soil Sampling
28. Making Bouncy Balls
29. Exploring the Shoreline
30. Color Changing Flowers
31. Roger Williams Zoo Trip
32. Edible Silly Putty 
33. Raising Tadpoles
34. More Microscope Fun 
35.  Homemade Ice Cream

Linking Up With: Thursday Favorite Things,



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