LAB Week 1

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Lab 1 – Introduction to Science

Exercise 1: The Scientific Method

In this exercise, you will answer the questions based on what you have seen in the videos throughout the lab. Be sure to pay careful attention to the videos – you will not only need them to complete this exercise successfully, but also to have a firm understanding of the scientific method for future labs.

QUESTIONS

Make an observation – Write down any observations you have made regarding the effect of pollution on the environment.

Answer = April 20, 2010 we experience a big oil spill in the Gulf of Mexico. Do to the oil spills it affected a lot of marine animals. It also affected the environment economically because fisherman couldn’t sell any fish, shrimp, crab etc. do to oil spills. Gas price went up tremendously.

Do background research – Utilizing the scholarly source (provided here), describe how pollution might affect yeast.

Answer =

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 =

Test with an experiment – Identify the dependent variable, independent variable, and the controlled variables for the experiment.

Answer =

Analyze results – Record your observations of the three test tubes before incubation and compare them to the observations provided in the video.

Answer =

 

Test   Tube

Initial   Appearance

 

Yeast   with No Pollutant

 

Yeast   with Salt Water

 

Yeast   with Detergent

Analyze results – Record your observations of the three test tubes after incubation.

Answer =

 

Test   Tube

Final   Appearance

 

Yeast   with No Pollutant

 

Yeast   with Salt Water

 

Yeast   with Detergent

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

Answer =

Draw conclusions – Interpret the data from the graph in Question 7. What conclusions can you make based on this graph?

Answer =

Draw conclusions – Based on your observations and your graph, would you reject or accept the hypothesis you made in Question 3? Why?

Answer =

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

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