Module One Lesson One Activity

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Fayetteville State University *

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370L

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Biology

Date

Jan 9, 2024

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Uploaded by SargentTitanium10589

Google Doc Access Directions: ● Please click on File in the upper left corner. ● If you are working on a Chromebook or Google Docs, choose the Make a copy option and save a copy of the document to your Google Drive. ● If not, choose the Download as option and then the Microsoft Word (.docx) option to download an editable copy of the document to your computer. Scientific Method and Questioning Choose four of the experimental questions, and design an experiment that would answer the experimental questions below and complete the following… a. establish a hypothesis AND a null hypothesis. b. identify the dependent and independent variables (may not apply to all) c. identify a possible control to use d. justify all claims with evidence e. identify data that might be collected f. ask at least 2 additional questions in order to solidify your experiment Experimental Questions (choose four to complete): 1. Do the wavelengths of light affect a plant’s growth? a. Hypothesis: If plants are exposed to specific wavelengths of light that are conducive to photosynthesis, then their growth will be enhanced. Null Hypothesis: There is no significant difference in the growth of plants exposed to different wavelengths of light. b. Variables: Independent Variable: Wavelengths of light (e.g., red, blue, green). Dependent Variable: Plant growth (measured in height or biomass). c. Control: Use a group of plants exposed to white light, which contains all wavelengths, as the control group. d. Justification: This control group ensures that any observed effects can be attributed to the specific wavelengths tested and not to the mere presence of light.

Module One Lesson One Practice Activity Name_______________________ e. Data Collection: Measure the height or biomass of the plants at regular intervals. Additionally, record any visible changes in leaf color or overall plant health. f. Additional Questions: How do different wavelengths of light impact the rate of photosynthesis in plants? Are there specific wavelengths that are more beneficial for specific types of plants? 2. Does the hormone estrogen increase the milk yield of dairy cows? a. Hypothesis: If dairy cows are administered estrogen, then their milk yield will increase. Null Hypothesis: There is no significant difference in the milk yield of dairy cows treated with estrogen compared to untreated cows. b. Variables: Independent Variable: Administration of estrogen (treatment or control). Dependent Variable: Milk yield (measured in liters or pounds). c. Control: Use a control group of dairy cows that do not receive estrogen treatment. d. Justification: The control group helps to isolate the effect of estrogen by providing a baseline for comparison. e. Data Collection: Measure the milk yield of each cow in both the treatment and control groups over a specified time period. f. Additional Questions: What are the potential side effects or health implications of administering estrogen to dairy cows? Are there optimal doses of estrogen that maximize milk yield without compromising the health of the cows? 2

Module One Lesson One Practice Activity Name_______________________ 3. Does the size of a fish tank determine how large a fish will grow? a. Hypothesis: If fish are placed in larger tanks, then they will grow larger in size compared to fish in smaller tanks. Null Hypothesis: There is no significant correlation between the size of the fish tank and the size of the fish. b. Variables: Independent Variable: Size of the fish tank. Dependent Variable: Size of the fish (measured in length or weight). c. Control: Use identical fish species in both small and large tanks with similar environmental conditions. d. Justification: Having identical fish species and environmental conditions ensures that any observed differences can be attributed to tank size. e. Data Collection: Measure the size of each fish in both small and large tanks at regular intervals. f. Additional Questions: How does the availability of space in a fish tank affect the behavior and overall well-being of the fish? Are there specific species of fish that are more adaptable to different tank sizes? 4. Do phosphates cause algae growth? a. Hypothesis: If water is enriched with phosphates, then algae growth will increase. Null Hypothesis: There is no significant correlation between the presence of phosphates in water and algae growth. b. Variables: 3

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Module One Lesson One Practice Activity Name_______________________ Independent Variable: Presence of phosphates in water. Dependent Variable: Algae growth (measured as biomass or cell count). c. Control: Use a control group with water containing no additional phosphates. d. Justification: The control group helps establish a baseline for algae growth, ensuring any changes can be attributed to the presence of phosphates. e. Data Collection: Measure the biomass or cell count of algae in both the treatment and control groups over time. f. Additional Questions: How do different concentrations of phosphates impact the rate of algae growth? What are the potential environmental consequences of increased algae growth, if any? 4

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