1. Define the term Independent Variable.
2. Define the term Dependent Variable.
3. How many independent variables should be included in an experiment? Why?
4. What does âtransgenicâ mean with respect to Bt corn?
5. Which cells in the corn plant will produce the Bt cry protein?
1. Define the term Independent Variable.
2. Define the term Dependent Variable.
3. How many independent variables should be included in an experiment? Why?
4. What does âtransgenicâ mean with respect to Bt corn?
5. Which cells in the corn plant will produce the Bt cry protein?
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Case Study The USDA conducted a series of experiments to determine the effect of European Corn Borer (ECB) infestation on the yields of four different varieties of corn â Golden Crop and Super Crop, and their genetically modified derivatives GC- 110 and SC-113. The genetically modified organisms (GMO) were engineered to be insect-resistant. Each corn plant produces a single ear of corn, with the number of kernels per ear depending on growth conditions [Fig 1]. Many problems, including insect infestation [Fig 2], plant disease, extreme weather conditions, or poor soil conditions, can decrease kernel yield. For the purpose of the USDA investigation, yield is defined as the kernel weight per ear of corn. All corn plants in this study were grown under the same environmental conditions (ie, soil type, water amount and sunlight exposure); however, the level of ECB infestation was varied. The results of the investigation are given in Table 1.
Questions
Question 1
Which of the following statements best expresses the scientific question addressed by the USDA investigation (see attached file)? [2 pt; L2; I.A.1]
How destructive is the ECB on four common corn varieties? | ||
How effective are GMO corn varieties in reducing the loss of yield to ECB infestation? | ||
What effect does GMO corn varieties have on the growth and development of ECB larvae? | ||
Are GMO corn varieties more resistant to ECB infestation than non-modified corn varieties? |
2 points
Question 2
In the USDA investigation, what were the independent variables? Select all that apply â partial credit is not awarded! [2 pt; L2; I.A.2]
The variety of corn plant used in the experiment. | ||
The number of plants tested in each treatment. | ||
The yield of kernels per ear of corn. | ||
The level of ECB infestation. |
2 points
Question 3
In the USDA investigation, what was the dependent variable? [2 pt; L2; I.A.2]
The level of ECB infestation. | ||
The yield of kernels per ear of corn. | ||
The number of plants tested in each treatment. | ||
The type of soil and amounts of water and sunlight the plants received. |
2 points
Question 4
In the USDA investigation, which of the following were controlled variables? Select all that apply â partial credit is not awarded! [2 pt; L2; I.A.2]
The type of soil in which the plants are grown. | ||
The amount of water each plant received. | ||
The yield of kernels per ear of corn. | ||
The level of ECB infestation. |
2 points
Question 5
In the USDA investigation, what was the negative control? [2 pt; L2; I.A.2]
Corn plants that were grown in the dark. | ||
Corn plants that were not exposed to ECB infestation. | ||
Corn plants that were grown with all-purpose plant food. | ||
Corn plants that were genetically modified to prevent flowering. |
2 points
Question 6
In the USDA investigation, what were the levels of treatment? [2 pt; L2; I.A.2]
amounts of sunlight and water provided to the plants | ||
number of ears produced per plant | ||
amount of food given to the plants | ||
low and high ECB infestation |
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?