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Photosynthesis Lab Mini Poster
Transcript of Photosynthesis Lab Mini Poster
Materials & Variables
The Effects of Different Types of Plants on Photosynthesis
Right or Wrong
Variables & Groups
Photosynthesis is related to Cellular Respiration, and in fact, is the opposite of it. The processes of photosynthesis get energy by absorbing wavelengths of light through chlorophyll found in chloroplast in plant cells. During the Light Dependent Reactions and the Calvin Cycle (Light Independent Reactions) glucose and oxygen are produced. This process can be summarized in an equation that shows the reactants and products:
How does the plant type affect the rate of photosynthesis?
6CO2 + 6H2O + ENERGY --> C6H12O6 + 6O2
The Spinach leaves will float fastest, then the Parsley, and then the Cilantro because the thickest leaves have more cells and therefore can release more oxygen quicker, making the leaf chads float.
1. Mix 0.6g of baking soda into 300mL of distilled water in 300mL beaker
2. Punch 10 leaf chads out of each type of leaf and place on paper towel separately (try to avoid major veins)
3. Place all 10 chads into the syringe and fill slightly with the bi-carbonated water and squeeze excess air out
4. Place finger on top of tip of syringe, pull down. This will create a vaccume and pull all the air out of the plant cells. Now let go.
5. Squeeze new air out. All chads should sink to botto, if not repeat step 4.
6. Once all chads have sunk, dump chads into the corresponding plastic cup.
7. Places glass bowl with a little bit of water on top of cup and place under sunlight. Record chads floating every minute
8. Repeat steps for each type of plant
1. Baking soda
2. Plastic Syringe
3. Living leaves (3 types)
4. Hole punch
5. Light source
6. 3 clear plastic cups
7. Distilled Water
8. 300mL Beaker
9. Stirring Rod
10. Paper Towel
11. Glass Dishes (to cover cups)
Independent Variable: Type of Leaf (Spinich, Cilantro, Parsley)
Dependent Variable: Rate of Photosynthesis
Constants: Molarity of H20, Time, Sun Light
Control Group: Spinach
1. Prepare 300 mL of .2% (.6 g) bicarbonate solution
2. Hole punch 10 leaf chads per type of leaf
3. Separate bicarbonate solution equally into three plastic cups (100mL each)
4. Label each cup as to what will be going in it
This experiment was set up in order to find out what effects the rate of photosynthesis. What was tested were different types of plants. It was set up to see which leaf chads produced the most oxygen the quickest. Started with removing all the oxygen within them and testing how long it takes the chads to produce enough to float in water.
The data gathered was limited to a 30 minute time frame and two of the types of leafs did not have all ten chads up by the end.
The hypothesis was partially correct. It was said that the Spinach would finish first, then Parsley, and then Cilantro. The results show that the Parsley had all 10 leaf chads up at 7 minutes and neither of the other two completely finished. However, at the end of the trials Spinach had 8 chads up where Cilantro only has 7 chads floating.
There was one major error in our data. It was concerning the Spinach trial, while attempting to place other plants in chamber the cup was bumped and all chads floated to top. Test had to be redone. If anyone else had tested the same hypothesis as we did then they should end up with the same or similar test results. Some questions that arouse from this test were:
- Would the results differ if the ratio of baking soda to water was increased.
- If we had gone till all 10 chads were up for the unfinished two would the Cilantro have had 10 up first.
AP Biology Investigation Labs: An Inquiry-Based Approach. Teachers Manual ed. New York: The College Board, n.d. Print.
The thicker leaf chads would have more cells and would go though more photosynthesis quicker.
Time Spinach Parsley Cilantro
0 0 0 0
1 0 0 0
2 0 0 0
3 1 3 2
4 2 6 4
5 2 9 4
6 3 10 4
7 3 10 4
8 3 10 4
9 3 10 4
10 4 10 4
11 6 10 5
12 6 10 5
13 6 10 5
14 6 10 5
15 6 10 5
16 6 10 6
17 6 10 6
18 6 10 6
19 6 10 6
20 7 10 6
21 7 10 6
22 7 10 7
23 7 10 7
24 8 10 7
25 8 10 7
26 8 10 7
27 8 10 7
28 8 10 7
29 8 10 7
30 8 10 7