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Photosynthesis Lab Leaf Disc Assay. A Block. .16 discs/sec. rate = 0.16 discs/sec. .05 discs/sec. Spinach had a rate that was more than three times higher than arugula - PowerPoint PPT Presentation
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Photosynthesis LabLeaf Disc Assay
A Block
Spinach (Control) Arugula
Number of Discs
FloatingTime
(seconds)Number of
Discs Floating
Time(seconds)
1 10 1 57
2 20 2 69
3 27 3 79
4 36 4 79
5 36 5 88
6 40 6 88
7 40 7 109
8 40 8 148
9 52 9 155
10 56 10 163
11 66 11 173
12 76 12 224
rate = 0.16 discs/sec
.16 discs/sec
.05 discs/sec
● Spinach had a rate that was more than three times higher than arugula
● The spinach was darker than the arugula, indicating higher concentrations of chlorophyll, which could have led to its higher rate
● The first arugula disc floated in the same amount of time that 10 spinach discs floated
Spinach Leaf v. Maple LeafPhotosynthetic Rate
Amy Keum, Sharon Jiang, Jess Barry, Sydney Kim
Our group found that the spinach leaf had a higher photosynthetic rate than the maple leaf. All the spinach leaf discs were able to float to the top of the solution in under four minutes, whereas not all of the maple leaf discs were able to float to the top in the ten minute span given.
Photosynthetic Rate of Spinach vs. Hibiscus Leaves
Hypothesis: If the photosynthetic rates of hibiscus and spinach leaves are compared, then lighter green hibiscus leaves will have a lower rate of photosynthesis than darker green spinach leaves.
● A 200 Watt bulb at a height of 12 inches was used to provide light for photosynthesis.
● 150 mL of a sodium bicarbonate and detergent solution was used for each trial.
● No measurable photosynthetic activity was observed in the Hibiscus leaves1.
● The spinach chads began floating after 210 seconds.● Spinach displayed an overall photosynthetic rate
of .13% chads/second while the hibiscus plant displayed an overall photosynthetic rate of 0% chads/second over a period of 10 minutes.
● This evidence supports not rejecting the hypothesis.
1 Activity was observed beyond the experimental observation period, confirming that the leaves were still alive and supporting the validity of the data.
Michael Colavita, Shanon Fan, Zach Kettering, and Becca Tibbitts
Comparing the Rates of Photosynthesis Between Spinach
and Rhododendron Plants
By: Anagha Iyengar, Raymond Huang, Julia Tseng, and Jasmine Gutbrod
Spinach (Spinacia oleracea) Rhododendron (Rhododendron ferrugineum)
→ Edible annual native to central Asia→ High nutritional value due to its abundance of vitamin A, vitamin C, vitamin K, Manganese, and Iron, along with other essential minerals→ Fresh spinach loses much of its nutritional value after a few days
→ Type of “woody” plant→ Considered native to the Alpine regions but are found across North America, Europe, Russia, Asia, Greenland, and Australia→ Common ornamental plant due to its hardy characteristics and pleasant flowers
Hypothesis + Overview
→ If the rates of photosynthesis of spinach and rhododendron leaves are tested, then <><><> will have the highest rate of photosynthesis. <explain why we think this>
→ The rates were calculated by the number of leaf discs of each plant type that rose to the surface after being submerged in a water, sodium bicarbonate, and detergent solution per minute.
DataTime(Min.)
.5 1 1.5
2 2.5
3 3.5
4 4.5
5 5.5
6 6.5
7 7.5
8 8.5
9 9.5
Number of Floating Spinach Discs
0 1 5 9 9 10
- - - - - - - - -
Number of Floating Rhodo.Discs
0 0 1 2 2 4 4 4 4 4 6 8 8 8 8 8 8 9 9
10
9
Observing how many leaf discs rise to the top of the solution in ten minutes.
Analysis
<conclusionish wrap-up>
Image Sourceshttp://www.freewallsource.com/green-wallpaper-7620.html
http://echolife.files.wordpress.com/2011/09/baby-spinach-leaves.jpg
http://thelifeofyourtime.files.wordpress.com/2010/11/dscf7286.jpg
Photosynthesis Lab
Kunal AggarwalLilly KeeleRachel MoreyHannah RosensteinA Block
Findings:● Rate of Photosynthesis of Spinach = 14/360 = 0.039
floats/sec● Rate of Photosynthesis of Lettuce = 12/360 = 0.033
floats/sec● Similar overall rate of photosynthesis (both reached
100% floating discs at 6 minutes, but had different disc totals because not all discs started sunken)
● Occurred at different paces○ Spinach rate started slower but sped up○ Lettuce rate started faster but slowed down
(initially appeared to have a higher rate)
Independent Variable = Type of plantDependent Variable = Rate of photosynthesisControl = Baby spinach leavesExperimental = Romaine lettuce