Photosynthesis Lab
Hypothesis
For the Calendula, we predicted that the uncovered leaves would produce the most starch, while the black and red covered ones would produce little to no starch. Meanwhile, we predicted the Coleus leaves to produce more starch in the green areas than the red areas.
Materials
-petri dish -red cellophane
-test tubes -black paper
-painter's tape -Calendula plant
-scissors -Coleus plant
-tweezers -Lugol's iodine
-paper towels
Procedure
1. Put Calendula leaves in red cellophane and black paper sleeves, leave for a day.
2. Roll up leaves and insert into test tubes.
3. Extract chlorophyll with hot EtOH.
4. Rinse off leaves with water, place in petri dish.
5. Cover leaves with iodine.
6. After 1 minute, remove leaves and place on paper towels, record data.
Data
For the Calendula, we predicted that the uncovered leaves would produce the most starch, while the black and red covered ones would produce little to no starch. Meanwhile, we predicted the Coleus leaves to produce more starch in the green areas than the red areas.
Materials
-petri dish -red cellophane
-test tubes -black paper
-painter's tape -Calendula plant
-scissors -Coleus plant
-tweezers -Lugol's iodine
-paper towels
Procedure
1. Put Calendula leaves in red cellophane and black paper sleeves, leave for a day.
2. Roll up leaves and insert into test tubes.
3. Extract chlorophyll with hot EtOH.
4. Rinse off leaves with water, place in petri dish.
5. Cover leaves with iodine.
6. After 1 minute, remove leaves and place on paper towels, record data.
Data
Data Analysis
Our results say that the Calendula produces more starch when it is under black and red sleeves, than when it is just normal. While the Coleus produces slightly more starch in the red areas, than the green ones. Our data didn't align with anyone else's data, so we probably made a mistake somewhere along the lines, we might have accidentally switched leaves or misinterpreted the iodine test, but I don't really know.
Our results say that the Calendula produces more starch when it is under black and red sleeves, than when it is just normal. While the Coleus produces slightly more starch in the red areas, than the green ones. Our data didn't align with anyone else's data, so we probably made a mistake somewhere along the lines, we might have accidentally switched leaves or misinterpreted the iodine test, but I don't really know.
Reflection
I found this lab to be enjoyable due to the ease of the experiment. However, my group was rather unhelpful, until I yelled at them and even then only two members actually helped. The two members who did little to no work were Archer and Ronan, however while Archer did around two things Ronan just sat there. Sawyer and Scottie were the ones who actually helped me, after being yelled at a little.
I found this lab to be enjoyable due to the ease of the experiment. However, my group was rather unhelpful, until I yelled at them and even then only two members actually helped. The two members who did little to no work were Archer and Ronan, however while Archer did around two things Ronan just sat there. Sawyer and Scottie were the ones who actually helped me, after being yelled at a little.