Purpose:
How does wavelength and intensity of light affect photosynthesis?
How does wavelength and intensity of light affect photosynthesis?
Hypothesis:
The red cellophane covered leaves won't get their needed red light and will increase the wavelength of the light. The black paper covered leaves will get less intense needed light. I think the uncovered leaves will produce more starch.
The red cellophane covered leaves won't get their needed red light and will increase the wavelength of the light. The black paper covered leaves will get less intense needed light. I think the uncovered leaves will produce more starch.
Materials:
Calendula and Coleus plants Black Paper Red Cellophane Pipets Petri Dishes |
Test Tubes Lugol's Iodine Scissors Sharpie Tape |
Procedure:
1. Cover two leaves of Calendula plant, one with black paper and one with red cellophane. Place calendula and coleus plants near a light source for 48 hours.
2. Cut off black, red, and control(normal) leaves of the calendula plant and put in separate labeled test tubes. Cut off red and green leaves from coleus plant and place each in a separate labeled test tube.
3. Extract Chlorophyll with hot alcohol. Then rinse off in water and place the leaves in separate labeled petri dishes.
4. Cover the leaves with Lugol's iodine and after 1 minute place each on a labeled paper towel. Record color change from 1-5.
1. Cover two leaves of Calendula plant, one with black paper and one with red cellophane. Place calendula and coleus plants near a light source for 48 hours.
2. Cut off black, red, and control(normal) leaves of the calendula plant and put in separate labeled test tubes. Cut off red and green leaves from coleus plant and place each in a separate labeled test tube.
3. Extract Chlorophyll with hot alcohol. Then rinse off in water and place the leaves in separate labeled petri dishes.
4. Cover the leaves with Lugol's iodine and after 1 minute place each on a labeled paper towel. Record color change from 1-5.
Data Analysis:
Our recorded data wasn't quite what we had expected because we figured the control leaf would produce the most starch. In our results the red cellophane covered leaf produced the most starch when it should have produced a little less than the control. The other strange thing was that the black paper covered leaf and the control leaf created the same amount of starch when the black leaf shouldn't have created any. We could have had some experimental error in making sure each leaf was in the right labeled container or in the amounts of iodine we put on each one since they weren't perfectly consistent. If our experiment had worked perfectly we should have come up that the control leaf created the most starch, the red leaf a little less than the control leaf, and the black leaf with little to no starch. In our coleus plants their amounts of starch growth should have been the opposite of what we observed, green being greater.
Our recorded data wasn't quite what we had expected because we figured the control leaf would produce the most starch. In our results the red cellophane covered leaf produced the most starch when it should have produced a little less than the control. The other strange thing was that the black paper covered leaf and the control leaf created the same amount of starch when the black leaf shouldn't have created any. We could have had some experimental error in making sure each leaf was in the right labeled container or in the amounts of iodine we put on each one since they weren't perfectly consistent. If our experiment had worked perfectly we should have come up that the control leaf created the most starch, the red leaf a little less than the control leaf, and the black leaf with little to no starch. In our coleus plants their amounts of starch growth should have been the opposite of what we observed, green being greater.
Reflection:
Through out this lab our group worked together well most of the time. We had a few flaws and mistakes along the way but we completed the lab and never had any arguments. We all contributed to leading at some point and making sure we stayed on task. We could have checked better to make sure that we were doing everything correct because from our data we obviously messed up somewhere. If we were to do this project again, I think we would do it a little slower to have less of a chance of mixing something up. Overall I think we worked well even though we had a few mess ups.
Through out this lab our group worked together well most of the time. We had a few flaws and mistakes along the way but we completed the lab and never had any arguments. We all contributed to leading at some point and making sure we stayed on task. We could have checked better to make sure that we were doing everything correct because from our data we obviously messed up somewhere. If we were to do this project again, I think we would do it a little slower to have less of a chance of mixing something up. Overall I think we worked well even though we had a few mess ups.