Directions: Read the paper entitled âEffect of environmental pH on chain length of Lactobacillus bulgaricusâ by Rhee and Pack, which has been uploaded to Blackboard in the Homework folder, and answer the following questions. Total points: 10 1. Which scientific approach (of the two that were adapted from Aristotleâs principles) does this study entail? [1] 2. What is the hypothesis, if this study has one? If there is no hypothesis, what is the primary observation or description of nature? [2] 3. Specify the independent variable. If there is no independent variable, answer ânone.â [2] 4. Specify the dependent variable. If there is no dependent variable, answer ânone.â [2] 5. List and specify any control variables. If there are no control variables, answer ânone.â [3] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC294746/pdf/jbacter00573-0007.pdf This site above is the article. please answer all !
Directions: Read the paper entitled âEffect of environmental pH on chain length of Lactobacillus bulgaricusâ by Rhee and Pack, which has been uploaded to Blackboard in the Homework folder, and answer the following questions. Total points: 10 1. Which scientific approach (of the two that were adapted from Aristotleâs principles) does this study entail? [1] 2. What is the hypothesis, if this study has one? If there is no hypothesis, what is the primary observation or description of nature? [2] 3. Specify the independent variable. If there is no independent variable, answer ânone.â [2] 4. Specify the dependent variable. If there is no dependent variable, answer ânone.â [2] 5. List and specify any control variables. If there are no control variables, answer ânone.â [3] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC294746/pdf/jbacter00573-0007.pdf This site above is the article. please answer all !
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Lab Topic 1: The Process of Science
Introduction
1. Which of the following questions would you consider appropriate scientific questions that can be tested using the scientific method? For the statements that can be tested using the scientific method, explain how your experiment would be set up. Explain the different steps in the scientific method as they relate to this statement.
a. Does the pH of the soil affect the color of hydrangea flowers?
b. What properties of the soil influence the color of hydrangea flowers?
c. Do hydrangeas look more beautiful when grown in the right soil?
d. Was The Day After Tomorrow a better movie than Terminator?
e. Does grass require fertilizer in order to grow?
2. Read this hypothesis and answer the questions below:
Plants kept closer to windows grow larger than plants kept several feet away from windows.
a. Indicate the dependent variable:
b. Indicate the independent variable:
c. List 3 other variables that must be kept constant in this experiment (the control variables).
d. Write a prediction based on the above hypothesis.
Exercise 1.1
Take a Deep Breath
Students will need to take a picture of themselves or their group walking up and down on the step or doing other exercise. Include a note with your name and date on an index card in the picture. Insert picture here:
1. Identify the following in the experimental design. You will need to refer to the protocol to answer this question.
a. Independent variable:
b. Dependent variable:
c. Experimental dataset:
d. Control dataset:
e. Hypothesis:
2. Fill in the data for each individual in your group for the Breath experiment.
Length of time breath can be held (seconds) | |||
Individual Tested | Resting | After 1 minutes of exercise | After 5 minutes of exercise |
Average (take the average for each column) |
3. Look at the averages for all individuals in your group. Was the hypothesis you stated in the previous question supported by the âaverage dataâ? Explain your answer!!!
4. Now look at the data for each individual separately. Was there data for anyone in your group that did not support the hypothesis? If yes, explain whythis could be.
5. How many replicates did your group have?________________ Why is it good to have more than one replicate?
Exercise 1.2
Letâs Graph
In this exercise, you will be graphing the data that you collected in exercise 1.1.
1. In exercise 1.1, you identified the independent and dependent variables. Which one goes on the X axis of the graph and which goes on the Y axis?
2. Will you make a line or a bar graph of your data? Explain why you chose this type of graph.
3. You will need to use excel to generate a graph of your data. On this graph, you will need to label the title, independent variable, dependent variable and possibly the legend. You will need to select an appropriate scale so the data is spread out on the graph.
*Consult with your instructor to see how he/she would like for you to submit your graph. You might work on it in class and submit it through D2L or you might submit it at a different time. If you are taking the online version of the class, you will need to use Excel or word to make the graph.
Exercise 1.3
You will need to get the data under exercise 1.3 in the protocol sheet to complete these sections.
1. What is the dependent variable?
2. What is the independent variable?
3. Which, if any, of these individuals has diabetes? ___A or B ___?
4. What data do you have to support your hypothesis?
5. Construct a graph showing the time after eating each group had the greatest blood glucose levels.
Instructions:
Read the scientific inquiry below. Use the data and your scientific knowledge, to complete the questions in each of the sections on the rest of this document. Place your answers, in the space provided and bold or change the color of the text of your answer. Once the assignment is complete, save it as a PDF document file. To submit this assignment, email the completed PDF document to your instructors email address by the due date/time. This assignment is to be done individually. Per the Angelina College student handbook, plagiarism will be will not be tolerated.
Scientific Inquiry:
A farmer wishes to determine which of the two fertilizers, Brand X or Brand Y, helps his corn crops grow at a faster rate in a five-week period of time. He asks his daughter, whom is a college freshman taking introductory biology, to design an experiment to help him test each fertilizer. They decide to grow three different crops of corn, each grown in a controlled environment, receiving the same amount of sunlight, same climate, soil type, and water. Crop 1 will receive no fertilizer during watering. Crop 2 will receive Brand X fertilizer while watering. Crop 3 will receive Brand Y fertilizer while watering. The farmer and his daughter performed the experiment and collect data on each fertilizer over a five-week period. Use the data, represented in Table 1, to complete the following assignment.
Table 1. Average height of corn plants when treated with Brand X or Brand Y fertilizer compared to corn plants not treated with fertilizer (control).
Time (T) in weeks | Control (cm) | Brand X (cm) | Brand Y (cm) |
0 | 0 | 0 | 0 |
1 | 1.3 | 1.4 | 1.2 |
2 | 2.4 | 2.7 | 2.3 |
3 | 4.2 | 8.3 | 7.3 |
4 | 6.8 | 12.4 | 8.2 |
5 | 8.7 | 16.8 | 11.6 |
Section 1: Representation
Define each term or variable, with respect to the scientific inquiry.
Independent variable-
Dependent variable-
Control group-
Experimental group(s)-
Hypothesis-
Write the equation to determine the average growth rate, with the appropriate values included, for each corn crop type (control, Brand X, and Brand Y). Use the equation shown below.
Growth rate = (T5 â T0)/5
Control =
Brand X =
Brand Y =
Section 2: Calculation
Solve the equations generated, in question 2, for each corn crop type. You must show your work, in the space below, for full credit.
Control =
Brand X =
Brand Y =
Section 3: Interpretation
Analyzing the data table and the calculated growth rates, complete the following questions.
Which crop type grew the fastest? Explain your answer using factual information.
Which plant was tallest? Explain your answer using factual information.
What can you conclude about the treatment of fertilizer on crop growth? Explain your answer using factual information.
Section 4: Application and Analysis
What could happen if the temperature were not controlled during the experiment? Would this impact treatment effectiveness on plant growth? Explain your answer.
Do you think the same outcome would occur if pine trees were used? Explain your answer.
If a particular fertilizer works on corn crops, should we be using that fertilizer on all plants? Why or why not?