Method for Measuring Changes in the Dependent variable The Dependent Variable for this experiment is the amount of leafs that rise to the top of the cup of water.
The levels are the same as the Independent variables as it is if the cup has Sodium Bicarbonate or not. The Independent variable for this experiment is whether the cups have the Sodium Bicarbonate in it or not. Hypothesis: The hypothesis of the collected group is that the cup with the Sodium Bicarbonate will produce more leafs that raise to the surface as this cup will have more carbon dioxide resulting in more photosynthesis. So when the leafs go through photosynthesis then the produced oxygen will make the leafs float to the surface, meaning the leafs are going through photosynthesis. This is the experiment because the one of the two tested cup with have baking soda in it which is Sodium Bicarbonate, which will produce Carbon Dioxide, which is need for photosynthesis. Purpose: The purpose of the Spinach Leaf photosynthesis is to measure the amount of how many leafs will go through photosynthesis in water. This shows how plants like spinach can hold there produce oxygen in the leafs which gives them there floating properties. Water does not ‘want’ or ‘need’ to go…ġ8 Citation of resources MLA Format Examples of unacceptable formats: 1) Dr.Intro: This experiment is aimed to how plants use there crucial elements of Carbon Dioxide in photosynthesis. Datum is singular Diffusion and osmosis are based on the random movement of molecules. Give actual data when describing the results This study shows (not proves) Data is plural, e.g., The data were graphed. You will discuss what the data mean in your Conclusion section. (which graphs specifically?) Include the table of the class data Chi-square analysis of class data Include a brief summary of results from all your graphs and the table.
Is there a difference in the concentration of stomata? What is your hypothesis and what are your predictions?ġ3 Class Data Group CO2 No CO2 1 11 10 2 4 3 8 9 5 14 6 Total 49 33 Record your group’s calculated rate of photosynthesis (# of disks floating/min)ġ4 Chi-Square CO2 No Co2 Observed 49 33 Expected 41 Punch out 15 disks Make them sink Record the # of disks floating (every 1 min) Run your experiment for 20 minutes!ġ2 Observe the stomata Compare the top and bottom sides of spinach leaves. I will complete the control.ġ0 Exercise 1: Measuring photosynthesis Spinach leaf disks experimentĬomplete the worksheet individually Graph your group’s results Title your graph and include units! Provide a caption for the graph Calculate the rate of photosynthesis (# of disks floating / min) Use the class data to answer the remaining questions Unitsġ1 Methods 1 2 3 Run your experiment for 20 minutes! 0.2 % What variable must we maintain constant? Hypothesis and predictions? CONTROLS? 0.2 % CO2 placed in the dark. Work in pairs, but complete the worksheet individually NaHCO3 + H2O NaOH + H2O + CO2 Variable one: Concentration of dissolved CO2 0 % vs. Work in groups, but complete the worksheet individually NaHCO3 + H2O NaOH + H2O + CO2 Variable one: Concentration of dissolved CO2 0 % vs % What variable must we maintain constant? Hypothesis and predictions? CONTROLS?ĩ Exercise 1: Measuring photosynthesis Spinach leaf disks experiment Presentation on theme: "Photosynthesis."- Presentation transcript:Ĥ Photopigments absorb specific wavelengths Photosynthesis is most efficient using red and blue wavelengthsĥ The stomata Stomata control the diffusion of CO2, H20, and O2 in and out of the leaf Plants open and close their stomata during the daytime in response to changing conditions: - light intensity - humidity - CO2 concentration The basic mechanism involves regulation of osmotic pressureĦ Photosynthesis on a global level…Where is it happening?Ģ005 NASA imaging How can we measure photosynthesis rates and what sort of events can effect this?ħ Exercise 1: Measuring photosynthesis Spinach leaf disks experimentĨ Exercise 1: Measuring photosynthesis Spinach leaf disks experiment
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