BioLab 1 Report

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San Juan College *

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2110

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Biology

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Jan 9, 2024

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Uploaded by CoachWhaleMaster324

N AME : L ATONNE W ILLIAMOSN S CIENTIFIC I NVESTIGATION -L AB R EPORT S HEET Exercise 1 – Questions and Hypothesis Lab Study A – Asking Questions 1) Does watching too much TV cause children to develop learning disabilities? What is the relationship between excessive TV viewing in children and the development of learning disabilities? 2) Should endangered species be cloned to prevent extinction? What are the potential benefits and the risks of using cloning technology to prevent the extinction of endangered species? 3) Does second hand smoke cause disease? What is the association between exposure to secondhand smoke and the risk of developing various diseases? Lab Study B – Developing Hypotheses 1) Does regular interaction with pets improve the health of the elderly? Regular interaction with pets positively impact the health of the elderly, which may lead to improved physical and mental well-being. 2) What effect do high concentrations of the industrial pollutant PCB (polychlorinated biphenyl) have on killer whale reproduction? High concentrations of PCB negatively impact killer whale reproduction, which may lead to decreased fertility rates and lower calf survival. Exercise 2: Designing Experiments to Test Hypotheses

Please use the lab scenario found in Exercise 2 in the Lab 1 Procedure to answer the following questions. Lab Study C. Determining Variables 1) Based on the scenario above determine the dependent variables. Leaf size of the corn plants, size of the corn produced, and the height of the corn plants 2) What is the independent variable in this experiment? The exposure to sulfur dioxide emissions 3) List the controlled variables base d on the scenario above. The type and variety of corn plants The number of corn plants The temperature, humidity, and light The duration of exposure to sulfur dioxide and the filtered air The type of containers used The soil type The watering and fertilization routine for the corn plants Lab Study D. Choosing or designing Procedures 1) What was the level of treatment in the scenario? The exposure of the corn plants to sulfur dioxide emissions from the coal- powered power plant. 2) Describe replication in the above experiment. Replication in this experiment is the process of repeating this experiment multiple times utilizing different groups of corn plants. In this experiment there are four groups of corn plants, with each group consisting of six plants. The process of replication helps to ensure that any of the observed effects are consistent and not due to chance. 3) In the case of the scenario, what was the control treatment? In this experiment the control treatment is the exposure to half of the corn plants that utilized filtered air. This group serves as a baseline to evaluate the effects of sulfur dioxide emissions. By exposing half of the corn plants to filtered air, the observed differences (if any) are measured variables. The two groups they can be attributed to the impacts to the sulfur dioxide emissions.

Lab Study E. Making Predictions 1) The hypothesis for the scenario was: “Emissions of sulfur dioxide from a coal- powered power plant lowers the reproduction of corn.” W hat should the prediction be? State your prediction. The prediction would be that the corn plants exposed to sulfur dioxide emissions will exhibit reduced reproduction when being compared to the corn plants exposed to filtered air. Exercise 3: Designing Your Own Experiment Lab Study F: Designing An Experiment Hypothesis Increasing the duration of sunlight exposure, will result in the enhancement of the pinto bean growth. Independent Variable The amount of sunlight exposure Dependent Variable Plant growth which is measured by the height if the plan and the number of leaves Controlled Variables Water, soil type, fertilizer, temperature, and the seed quality Control Groups The group of pinto bean plants that will be exposed to the typical amount of natural sunlight that they will receive in the area where they are at. The experimental group of the pinto bean plants will be exposed to an increased duration of natural sunlight and supplementing artificial lighting. Level of Treatment Involves the manipulation of the duration of the sunlight exposure by providing artificial lighting to the experimental group. Replication

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For the reliability of results, there will be multiple sets of pinto bean plants which will be grown and tested. Each set of pinto bean plants will include several plants in both the control and experimental groups. Summary This experiment will involve two groups of pinto bean plants growing under controlled conditions. The control group will be exposed to the normal amounts of natural sunlight in the area they are planted, while the experimental group will receive natural sunlight and additional artificial lighting to extend the duration of sunlight exposure. Both of these groups will receive the same amount of water, fertilizer, and will be grown in the same type of soil. The growth of the plants will be monitored by measuring the height of the pinto bean plant and by counting the number of leaves each plant has. Multiple sets of plants will be used to ensure replicability to be able to validate the results. Prediction The prediction is that the pinto bean plants that are being exposed to an increased duration of sunlight through the use of supplemental artificial lighting, will exhibit greater growth measured by the increased height and a higher number of leaves compared to the control group receiving typical amounts of natural sunlight.

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