How Does Caffeine Affect Plant Growth

The independent variable was the amount of motor oil in 2% salt solution because it is the variable that was being tested and purposefully manipulated. The dependent variable was the hatching viability of the brine shrimp tested (which was calculated by adding the number of brine shrimp swimming at 24 hours to the number of brine shrimp swimming at 48 hours, and then divided by the total number of eggs initially placed in the petri dish). The control group was a petri dish of brine shrimp in 30 ml of 2% salt solution with no motor oil. The constants, or variables that need to be controlled, were the salinity percentage of the salt solution (2%), the amount of salt solution in each petri dish (30 ml), the total time the brine shrimp were left in the petri dishes (48 hours), and the frequency of when the brine shrimp were checked (every 24 hours).

Research Question: This investigation will determine the how the amount of water (independent variable) affects the amount the amount of time (dependent variable) it takes for the Alka-Seltzer to dissolve.

The independent variable for the experiment was the paper towels. The dependent variable was the absorbency and strength. The constants for the experiment were the size of the paper towels that were used, the amount of water, the size of the beaker, the size of the cylinder and the amount of the weight.

This project was to see the effect that caffeine would have on plants. This project was to figure out which amount of caffeine was to make the plant grow the most. The test subject plants that were used in this experiment was Basil. Basil is a plant that sprouts very quickly. It is supposed to sprout in around 10 days. The plant Basil has no caffeine in it to start with. The only plant that has sprouted was the control plant that had no caffeine in it’s soil at all. We used caffeine tablets instead of coffee grinds which are more natural because they are high on nitrogen. There was two with 400 mg of caffeine in them. Next there was two plants with 800 mg of caffeine in them. Lastly there was two plants with 1600 mg of caffeine in them. In

In our Penny Lab, we wanted to extend what we were told to do with experimental design. We’re doing this because we wanted to prove what he thought our hypothesis had been, and a hypothesis can not be true unless it can be tested. We investigated what variables made the Penny Lab easier, or harder. As a class we decided to investigate variables like, dropping the penny from the same height, and applying the same pressure to the penny for each drop. But first we had to know what variables were, and which variables we needed to use in the experiment. The variables were, the independent variable, dependent variable, the experimental group, and the control group. We investigated this to show how much water a penny could hold, but we introduced

Describe the experimental method, state its advantages and disadvantages, and distinguish between independent and dependent variables.

Describe the experimental method, state its advantages and disadvantages, and distinguish between independent and dependent variables.

In order to test my hypothesis, eight separate plots containing a certain amount of Simploids and plants were used. A total of four plots were utilized as the experimental group, in order to conduct the analysis and test the effects of parasites on the health of the Simploids. The remaining four plots were used as the control group, where they resembled the experimental groups in terms of sample size but received no exposure to parasites. Thus, the four experimental plots that were infested with parasites were each given a sample size of fifty Samploids and fifty plants. This was done as a form of replication in an attempt to identify if there were any outside factors that could be contributing to a change in the Samploids’ health. Thus the control group was composed of the same variables as the experimental group with the exception of parasite exposure.

Variables: In this experiment, the temperature (in degrees Celsius) of the chemicals is the independent variable. To change the temperature, the materials are placed in a bath of water being heated by a hotplate.

The independent variable of my experience meant is what I’m going to be changing which is the substance, coffee. The dependent variable of my experiment is the Daphnia’s heartbeat per minute, which will also increase immensely. The units I will be using to collect the data is one minute per trial.

In this project I will try to find out if the plants will grow better normally or in the aerogarden. I will see how the aerogarden affects the plant growth. I will plant strawberries in both of the systems and see which plants grow faster. I will record the growth every single week. Then I will put it on my project.

Another qualitative observation made was that the grass grew slanted and towards the sun. A quantitative observation we made was that the grass with 1 tsp. and 2 tsp. of fertilizer had 7 strands of grass growing in the cup. Our hypothesis was not supported, we said that the 1 tsp. would grow the tallest, when in reality the cup without any fertilizer grew the tallest most healthiest grass. We think it was because the fertilizer that we used needed a bit more time to activate, not just a week or two. One uncertainty were that in our next experiment we would have liked to have more time for the plants to grow. Another uncertainty was that we only did one of each amount of fertilizer, which could make the results less accurate. Some questions that we have wondered throughout this experience is, “what if we use the same amount of fertilizer on other types of plants?” and “I wonder if other people have done this experiment before, and what were their results?”. In our next experiment we plan to use different types of fertilizers and plants, so we can see how they are affected as well. Society can benefit from this experiment in many ways, one way is people learned how much fertilizer is really needed for grass, instead of just looking at

* In every experiment there are variables that affect the way an experiment will go. The three types of variables that are measured are Independent, Dependent, and Controllable variables. In my experiment the Independent variable is the three different models of paper airplanes that I have chosen to make and experiment with. The Dependent variable includes the distance the paper airplane goes. The Controlled variable is me making sure that I throw the paper airplanes from the same starting point a well as the same weather conditions. The controlled variable is the one that cannot be changed because it would affect the other two variables. In this case I threw them in my house since I have a very long hallway that leads into the front family room and there is no furniture that would interfere with the results.

The independent variable in this experiment is the time of day at which the plant is watered. I know this because that is the one thing being changed in the experiment. The dependent variable is the growth of the plant. I know this because “growth of the plant” comes directly after “affects”

In Part 1, I conducted a statistical experiment to determine if a linear relationship exists between each of my independent variables and my dependent variable, which were biological in nature. My independent variables were height (inches) and age (years). My dependent variable was weight (pounds). The goal of my experiment was to observe a linear correlation between an 18-22 year-old male’s height and weight. I collected my data by randomly selecting a sample size of 25 male individuals who attend Montclair State University. The best method of prediction would