Planting Science - Projects: lhselligposfall2023 project 13
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lhselligposfall2023 project 13

Project by group lhselligposfall2023

Explore We know that plants photosynthesize. We know that the mass of a plant comes from photosynthesis. We discovered that photosynthesis can happen even when a leaf is not connected to a plant. Plants' ability to photosynthesize interests us.
Research Question How does changing the plant we create leaf disks from affect the rate of photosynthesis?
Predictions We think that the spinach leaf disks will float before the rhododendron leaf disks. We think this because spinach leaves are thicker (as opposed to rhododendron leaves), which means there are more chloroplasts to photosynthesize, which means they will release oxygen quicker, and therefore will float sooner than the rhododendron leaf disks
Experimental Design Step one: create leaf disks out of rhododendron leaves and spinach leaves. 3 disks per leaf type. Step two: Prepare baking soda and water solution and infiltrate leaf disks using the same method as the leaf disk lab, but use 50 ml beakers instead of plastic cups, and 40ml of water per beaker. Prepare only two beakers (both with baking soda solution) using this method. Step three: Place spinach and rhododendron leaf disks in separate beakers with the baking soda and water solution. Place these cups under a lamp, 3 – 5 cm away from the lamp. Step four: Turn lamp on, start stopwatch. Record the amount of floating and not floating leaf disks in each cup every minute. When all leaf disks have risen in each cup, stop recording.
Conclusion We found that the rhododendron leaves rose quicker than the spinach leaves. This answers our research question in that different plants photosynthesize at different rates, as if they photosynthesized at the same rates, every leaf disks would rise at the same time. We had no problems, but we noticed that one leaf disk rose, then the next minute fell, then the next minute rose again. This did not affect our results as the rhododendron leaves rose marginally faster than the spinach leaves.
Investigation Theme POS
Grade Level High School Students (Grades 9,10,11,12)
Teacher Name Jacqueline Ellig
School Name Lynden High School
Session Fall 2023
About this Project I think that this team did a great job of engaging with scientific thinking. You can easily follow their questioning and decision-making process throughout the development and execution of their experiment, while engaging with the scientists who were involved. -- Meghan Britton, Liaison



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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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