Planting Science - Projects: This Pun is Oak-kay
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This Pun is Oak-kay

Project by group sjalodesfall2017

Explore We know that plants do photosynthesis, and that they need light and water to grow.
Research Question How do different colored lights effect the rate of photosynthesis?
Predictions We predict that the purple colored light work best because it will absorb the violet waves the best.
Experimental Design Three cups were filled with water that had been breathed in (for CO2) because this was the best way to get spinach discs to photosynthesize, as supported by a previous experiment. Then, syringes were filled with breath-water and ten spinach discs each, and the air was extracted so that the discs sank. The discs were then deposited into their respective cups. Each cup was placed under a different colored light. Cup one under green light, cup two under purple, and the third under white light. Cup three is the control. Every minute for twenty minutes, the number of leaves floating and sinking in each cup was recorded.
Conclusion In the control cup, all ten discs rose. In the purple cup, seven out of ten rose, and none rose in the green cup. This could be because spinach discs absorb white light the best, and so is best able to use that to photosynthesize. Because green light is reflected, it is not able to be used for photosynthesis. Some purple light is absorbed, so photosynthesis using it is possible. To expand, one might try this experiment using different plants to see if the rate of photosynthesis is impacted by that.
Investigation Theme POS
Grade Level High School Students (Grades 9,10,11,12)
School Name St Joseph's Academy
Session Fall 2017

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NSF_Logo.jpg This material is based upon work supported by the National Science Foundation under Grant #2010556 and #1502892. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.

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