|Explore||We know from class that the amount of carbon dioxide increases the rate of photosynthesis. We tested our breath and baking soda as sources of carbon dioxide. We wondered if we could use different sources of co2.|
|Research Question||What is the effect of dry ice concentration on the rate of photosynthesis?|
|Predictions||We weren't sure if the co2 in dry ice would help or harm the rate of photosynthesis in the spinach leaf disks. We were worried that the old temperatures would harm he plants.|
|Experimental Design||We used the same leaf disk procedure from the previous labs to make 4 cups. Cup 1 had no added co2, cup 2 had 3.0 grams of dry ice, cup 3 had 6.5 g of dry ice and cup 4 had 8.6 grams. We mixed hot water with each dissolved solution of dry ice so that each cup had 100 ml of water at 20 degrees...|
|Conclusion||We investigated the effect of dry ice concentration on the rate of photosynthesis in leaf disks. Bryan predicted that the leaf disks would be harmed by the dry ice. However, the data showed the opposite. The cup with the most dry ice, 8.6 g floated all their leaf disks very quickly, by 10...|
Hi team! How's it going this week? It looks like you might be beginning to set up your initial experiments! I am working on setting up some of my own experiments this week at my lab, with DNA. It is taking me a while to get all of my supplies assembled, but hopefully I can start my own tests soon.
An experiment our group wants to test how long it takes for leaf disks to rise if we use dry ice, but we would have to heat the water up with a hot plate
The light intensity affected the leaf disks and photosynthesis in the way of the cup closest to the light photosynthasised first but plateaued for the rest of the test, the second farthest away photosynthasised a little bit slower and didn't plateau, and the cup with no light did not photosynthasize.
if you put the cup closest to the light in the dark, it would no longer photosynthisize and would sink because of cellular respiration
Hi team--great name! I see that you have already collected some data. I really like the graph you created; the use of different colors for different curves really makes it easy to see the difference between the different treatments. I got a chance to try out this same experiment this summer and my favorite part was preparing the leaf punches in the syringe.
At the bottom of your worksheet, you mention that differences in the concentration of carbon dioxide led to different results in terms of how fast leaf disks float. What do you think might be going on inside the leaf disks during the process of photosynthesis that cause them to float?
I was also curious to know, after doing the experiment, if you had any ideas for new research questions you could test. What part of the experiment did you find most interesting?
Hi everyone! My name is Cathy and I am a molecular biologist...which means I love studying the insides of cells, including RNA, DNA, and protein. I have lived and worked in multiple states as a part of my work as a scientist, including WI, PA, IA, MD, and the DC area. My jobs have included working as a professor for college students, working for government research labs, and traveling around Wisconsin to teach people about biotechnology. Currently, I work for the Department of Agriculture in Ames, IA, which is also where Iowa State is located. I am also a Master Gardener and I enjoy teaching people about plants--especially growing vegetables! I am looking forward to working with you on this project. Please feel free to ask me questions as well about working as a scientist, whether it is questions about classes in college or about what it is like to work in a lab.