Write on the space provided.
1. Mr. Perez wanted to see if the color of light shined on a plant had an effect on the number of leaves it had. He gathered 2 groups of the same species of plants, gave them the same amount of water, and did the test for the same amount of time. On one group of plants he used white light. On the second group he changed the light color to red.
a. Experimental Group
b. Control Group
2. You are managing a large feed lot of cattle. A pharmaceutical company wants you to try a new antibiotic to treat shipping fever in newly arrived cattle. You are currently not using any antibiotic to treat shipping fever in your cattle. The company claims that it is more effective and will save you money using this antibiotic. You will use the same feed, water and conditions of the cattle. You will measure the temperature of the cattle's fevers to see whether or not the new antibiotic works on treating shipping fever.
a. Experimental Group
b. Control Group
3. Carlo notices that his shower is covered in a strange green slime. His friend Marco tells him that coconut juice will get rid of the green slime. Carlo decides to check this out by spraying half of the shower with coconut juice. He sprays the other half of the shower with water. After 3 days of "treatment" there is no change in the appearance of the green slime on either side of the shower.
a. Experimental Group
b. Control Group
EXERCISE 3. REDI'S EXPERIMENT
Answer (2)
In scientific experiments, researchers often use experimental and control groups to determine the effect of a specific variable. Here is how these terms apply to the scenarios listed:
Mr. Perez's Plant Experiment
a. Experimental Group: This is the group of plants that are exposed to the red light. Mr. Perez is changing this variable (the color of the light) to see its effect on the number of leaves.
b. Control Group: This is the group of plants that are exposed to white light. White light is considered the 'normal' condition, providing a baseline to compare against the experimental condition.
Cattle Antibiotic Experiment
a. Experimental Group: The group of newly arrived cattle treated with the new antibiotic. This group is used to test the effectiveness of the new treatment.
b. Control Group: This would be a similar group of cattle that do not receive the new antibiotic. Since there was no current antibiotic being used before, these cattle would help identify the natural course of the fever without the intervention.
Carlo's Shower Experiment
a. Experimental Group: The side of the shower sprayed with coconut juice. This side tests the efficacy of coconut juice in treating green slime.
b. Control Group: The side of the shower sprayed with water. Water acts as the baseline treatment to compare against the coconut juice.
In scientific experiments like these, the control group helps establish a standard for comparison, ensuring any observed effects in the experimental group are due to the variable being tested and not other factors.
In each experiment, the experimental group receives the treatment being tested, while the control group does not receive the treatment and serves as a comparison. Mr. Perez's plants under red light, the cattle treated with the new antibiotic, and Carlo's shower section treated with coconut juice all represent the experimental groups. The respective control groups include plants under white light, untreated cattle, and the section of the shower treated with water.
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