1Sampson Fletcher, Thy Nguyen, Olivia Sisopha Advanced Plant Biology The effect of the application of caffeine on the Marigolds will be the slowing of its growth rate from lack of nutritionSampson Fletcher, Thy Nguyen, Olivia SisophaLincoln High SchoolAdvanced Plant BiologyPeriod 3
2IntroductionFor our ongoing experiment, we asked a simple question: what would happen if we watered with diet coke? The experiment was designed to show the effects of caffeine on marigolds over a set period of about a month. Previous experiments in the past have led to near similar conclusions of a decrease in growth rate
3PurposeOur purpose of doing this experiment is to see the results of marigolds when caffeine is applied. Seemed simple with the most obvious results with enough sufficient data to prove our theory.
4Problem (Testable Question) How does the addition of caffeine when applied to plants affect the growth rate of the 120 Marigolds when applied?
5HypothesisIf Caffeine is applied to the 120 Marigolds, the growth rate will decrease because of its high content of caffeine that lacks the nutrition necessary to excel plant growth.
6VariablesManipulated Variable: Caffeine which is applied to our 120 MarigoldsResponding Variable: The growth rate of our 120 Marigolds with the application of CaffeineControlled Variable: Sterile greenhouse soil, Flats containing Marigolds, Six packs
7Muhahah he’s trying not to smile =] ----> Experimental Control: 60 Marigolds without the application of Diet Pepsi/CokeValidity Measures: Clean hands to apply our caffeine, clean cups to effectively apply our caffeine
8AbstractThe overall objective of the project was to observe the effects of the application of caffeine on the growth rate of plants. To do this we applied exactly 1 liter of both coke and pepsi, to an equal number of 60 plants per pack. Over the course of about 3 months we would regularly record the growth rate of all 3 flats, comparing the control (in this case the flat with only water) to the results of the flats with the application of diet coke and pepsi. The results produced show a significant difference between those with water and those with the caffeine. Towards the last measurement it could be concluded that there was an average difference of over 1.5 centimeters in growth.From this project overall it can be concluded that with the application of caffeine on a set number of fast plants, you will see, after a set period of time( at the least 2 months) a significant loss in growth rate for those with caffeine, and a continuous steady growth for those with water. The difference is quite obvious
10Methods Flats are given an equal amount of potting soil and fertilizer Plant seeds are added and set in greenhouse, until time of transplantingMarigolds are transplanted into 3 flats each housing 60 MarigoldsWater is applied to the control, while an equal application of Diet Coke is added to the 2nd flat, with Diet Pepsi added to the 3rdEvery watering period, repeats step 3 and record what you see each period
11Data Date: Height: Description: November 29, 2007 December 17, 2007 Dp:2 centimeters/5 plantsDc:2 centimeters/5 plantsAll plants look healthyDecember 17, 2007Dp:3.6 centimeters/ 5 plantsDc:3.5 centimeters/ 5 plantsNoted color loss..December 18, 2007SameDecember 19, 2007Dp:3.7 centimeters/ 5 plantsDc:3.6 centimeters/ 5 plantsJanuary 9, 2008NoneMore noted loss of height of those with caffeine appliedJanuary 14, 2008Dp:3.4 centimeters/ 5 plantsDc:3.3 centimeters/ 5 plantsThose with caffeine have tilted to one side with an average of 1 death a packJanuary 15, 2008Significant drop in both color and plant heightJanuary 22, 2008
13ConclusionFrom this project overall it can be concluded that with the application of caffeine on a set number of fast plants, you will see, after a set period of time( at the least 2 months) a significant loss in growth rate for those with caffeine, and a continuous steady growth for those with water. The difference is quite obvious