The Affect of Different Amounts of Yeast Exposed to Sugar and Water
Introduction
The purpose of this lab was to determine how to amount of yeast in a test tube, containing sugar and warm water, would affect the growth of the mixture. Yeast grows when exposed to glucose and most liquids. This is what causes bread, and other baking goods to rise when left out. In this lab, we will experiment with different amounts of yeast and see how that affects the growth of the mixture of yeast, sugar, and water. The guiding question for this lab was: How does a change in the amount of yeast exposed to a constant amount of sugar affect the growth of the mixture? The independent variable in this lab was the amount of yeast, and the dependent variable was the amount of growth. The control was a test tube filled with 25 milliliters of water around 40 degrees Celsius, 2 grams of sugar, and 2 grams of yeast. Finally, our hypothesis for this lab was: If the amount of yeast exposed to sugar increases, then the amount of growth will also increase, because the more yeast there is the more a mixture will rise.
Methodology and Procedure
This section can be in a narrative format or numbered format. A descriptive paragraph will suffice, simply tell the reader what you did in the experiment. Be sure to give amounts for solutions and describe the measurements collecte
Data and Results
Every test except for the one with two grams of yeast went over the top of the test tube, so we had to estimate the growth of those particular tests, but we believe we were accurate.
The graph above shows a graph of the affect of more yeast in a test tube containing sugar and warm water. As you can see, the more yeast that is inside the test tube, the more the mixture grows.
Below is a table containing the collected information of the tests that were performed to test the affect of more yeast on the average growth of the mixture containing yeast, sugar, and warm water. Note that the yeast was left to sit for eight minutes before having its growth recorded.
Amount of Yeast (g)
Amount of Sugar (g)
Amount of Water (mL)
Average Growth (cm)
2
2
25
5.55
3
2
25
10.35
4
2
25
9.8
Discussion and Analysis
The discussion is based on your actual results, whether they were expected or not. Explain the significance of your results. Were they what you predicted? Why or why not? How do your results relate to the “because” portion of your hypothesis?
Do NOT re-write your results.
This section is where you are to EXPLAIN YOUR RESULTS and what they mean. You should develop inferences based both on your experimental observations and on your prior knowledge of the topic. Your inferences must logically follow and be supported by your results. Discuss trends observed throughout your experiment.
Explain why certain data was important and decide if and how the data supported your hypothesis.
Discuss any weaknesses/problems in the experimental design. Identify sources of error.
Suggestions for improvement and design changes to remedy errors or weakness in the design.
This section is where you state whether or not the data supported the hypothesis. Ex: The data collected did not support the hypothesis. (Do not use the word “my” in this sentence.)
Talk about significant results, and explain how your data fits into the body of knowledge on the topic. Avoid indicating a definite cause-and-effect relationship.
Identify limitations. There are always factors outside of your control that influence your results. It’s important to identify these factors before, during, and after the investigation.
Generate new questions. A good experiment raises as many or more questions than it answers. List further questions that you have and suggestions for further research.
Works Cited
It is extremely important that you cite any and all sources that you use for your experiment. This includes any graphics that you use. Refer to the MLA Citation Guide in the Writing Handbook for proper format. You may skip this section if the only materials used were instructions given by your teacher (verbal or written).
The Affect of Different Amounts of Yeast Exposed to Sugar and Water
Introduction
The purpose of this lab was to determine how to amount of yeast in a test tube, containing sugar and warm water, would affect the growth of the mixture. Yeast grows when exposed to glucose and most liquids. This is what causes bread, and other baking goods to rise when left out. In this lab, we will experiment with different amounts of yeast and see how that affects the growth of the mixture of yeast, sugar, and water. The guiding question for this lab was: How does a change in the amount of yeast exposed to a constant amount of sugar affect the growth of the mixture? The independent variable in this lab was the amount of yeast, and the dependent variable was the amount of growth. The control was a test tube filled with 25 milliliters of water around 40 degrees Celsius, 2 grams of sugar, and 2 grams of yeast. Finally, our hypothesis for this lab was: If the amount of yeast exposed to sugar increases, then the amount of growth will also increase, because the more yeast there is the more a mixture will rise.
Methodology and Procedure
Data and Results
Every test except for the one with two grams of yeast went over the top of the test tube, so we had to estimate the growth of those particular tests, but we believe we were accurate.
The graph above shows a graph of the affect of more yeast in a test tube containing sugar and warm water. As you can see, the more yeast that is inside the test tube, the more the mixture grows.
Below is a table containing the collected information of the tests that were performed to test the affect of more yeast on the average growth of the mixture containing yeast, sugar, and warm water. Note that the yeast was left to sit for eight minutes before having its growth recorded.
Amount of Yeast (g)
Amount of Sugar (g)
Amount of Water (mL)
Average Growth (cm)
2
2
25
5.55
3
2
25
10.35
4
2
25
9.8
Discussion and Analysis
Works Cited