Due today
Week One Lab Reporting Form 1. Make an observation – Write down any observations you have made regarding the effect of pollution on the environment.
2. Do background research – Utilizing the scholarly source (provided here), describe how pollution might affect yeast.
3. Construct a hypothesis – Based on your research from question 2, develop an if-then hypothesis relating to the effect of pollution on yeast respiration. Answer =
4. Test with an experiment – Identify the dependent variable, independent variable, and the controlled variables for the experiment. Answer =
5. Analyze results – Record your observations of the three test tubes before incubation and compare them to the observations provided in the video. Test Tube Initial Appearance Yeast with No Pollutant dry, sits as dry separate tiny particles
Yeast with Salt Water Yeast sits at the bottom of salt water in thick plaster form
Yeast with Detergent Sits evenly through liquid detergent as a thick plaster form
6. Analyze results – Record your observations of the three test tubes after incubation. Test Tube Final Appearance Yeast with No Pollutant dry, sits as dry separate tiny particles
Yeast with Salt Water Yeast is complete liquid from Yeast with Detergent yeast is a thick plaster form
7. Analyze results – The table below shows sample data regarding the amount of carbon dioxide produced by each tube. Determine what type of graph would be the most appropriate for displaying the data and explain why you chose that graph. Then, make a graph. Use Microsoft Excel or a free graphing program (for example, https://nces.ed.gov/nceskids/createagraph/) to create the graph. Submit this with your post-lab questions. Sample Amount CO2 Produced (mL) After 1 Hour Yeast with No Pollutant 7 mL Yeast with Salt Water 0.5 mL Yeast with Detergent 0 mL
8. Draw conclusions – Interpret the data from the graph in Question 7. What conclusions can you make based on this graph? The salt water produced a small portion of CO2 while, no pollutant and detergent caused none. 9. Draw conclusions – Based on your observations and your graph, would you reject or accept the hypothesis you made in Question 3? Why? Answer =
10. Draw conclusions – Imagine you are an environmental scientist employed by a city. Some residents have expressed concerns regarding how salt is applied to roadways in the winter because of the harm it may cause aquatic life in area streams. Propose an experiment using yeast to determine if salt pollution runoff is a potential concern in your community. Answer =
References Any sources utilized should be listed here.