Your Full Name: UMUC Biology 102/103
Lab 1: Introduction to Science
INSTRUCTIONS: On your own and without assistance, complete this Lab 1 Answer Sheet
electronically and submit it via the Assignments Folder by the date listed in the Course
Schedule (under Syllabus).
To conduct your laboratory exercises, use the Laboratory Manual located under
Course Content. Read the introduction and the directions for each exercise/experiment
carefully before completing the exercises/experiments and answering the questions.
Save your Lab 1 Answer Sheet in the following format: LastName_Lab1 (e.g.,
Smith_Lab1).
You should submit your document as a Word (.doc or .docx) or Rich Text Format
(.rtf) file for best compatibility. ©eScience Labs, LLC 2014 Exercise 1: Data Interpretation
Dissolved oxygen is oxygen that is trapped in a fluid, such as water. Since many living organism
requires oxygen to survive, it is a necessary component of water systems such as streams,
lakes and rivers in order to support aquatic life. The dissolved oxygen is measured in units of
ppm (parts per million). Examine the data in Table 4 showing the amount of dissolved oxygen
present and the number of fish observed in the body of water the sample was taken from; finally,
answer the questions below. Post-Lab Questions
1. What patterns do you observe based on the information in Table 4? Each sample of dissolved oxygen increased by 2 ppm’s in the table.
2. Develop a hypothesis relating to the amount of dissolved oxygen measured in the
water sample and the number of fish observed in the body of water. If the amount of dissolved oxygen goes above 12 ppm’s the number of fish observed
begins to decrease.
3. What would your experimental approach be to test this hypothesis? I would test 1 individual sample of dissolved oxygen starting at 12. i.e.-12,13,14,15,16,17
and 18 to observe the number of fish per unit of dissolved oxygen,
4. What would be the independent and dependent variables? Independent-Dissolved Oxygen Dependent- Number of Fish
5. What would be your control? The control could account for environmental factors such as temperature of water,
sunlight or predators in the surrounding area.
6. What type of graph would be appropriate for this data set? Why? A bar chart- It would show each sample clearly and independently.
©eScience Labs, LLC 2014 7. Graph the data from Table 4: Water Quality vs. Fish Population (found at the
beginning of this exercise).
8. Interpret the data from the graph made in Question 7. Exercise 2: Experimental Variables
Determine the variables tested in the each of the following experiments. If applicable, determine
and identify any positive or negative controls. Observations
1. A study is being done to test the effects of habitat space on the size of fish populations.
Different sized aquariums are set up with six goldfish in each one. Over a period of six
months, the fish are fed the same type and amount of food. The aquariums are equally
maintained and cleaned throughout the experiment. The temperature of the water is kept
constant. At the end of the experiment the number of surviving fish is surveyed.
A. Independent Variable: Six Goldfish
B. Dependent Variable: Tank Size
C. Controlled Variables/Constants: Water Temperature
D. Experimental Controls/Control Groups: Type of food/fish
2. To determine if the type of agar affects bacterial growth, a scientist cultures E. coli on four
different types of agar. Five petri dishes are set up to collect results: One with nutrient agar and E. coli One with mannitol-salt agar and E. coli ©eScience Labs, LLC 2014 One with MacConkey agar and E. coli
One with LB agar and E. coli
One with nutrient agar but NO E. coli All of the petri dishes received the same volume of agar, and were the same shape and size.
During the experiment, the temperature at which the petri dishes were stored, and at the air
quality remained the same. After one week the amount of bacterial growth was measured.
A. Independent Variable: Ecoli
B. Dependent Variable: Type of Agar
C. Controlled Variables/Constants: The Volume of Agar
D. Experimental Controls/Control Groups:Air Quality & Temperature Exercise 3: Testable Observations
Determine which of the following observations (1-6) are testable. For those that are testable
answer the following questions: Determine if the observation is qualitative or quantitative
Write a hypothesis and null hypothesis
What would be your experimental approach?
What are the dependent and independent variables?
What are your controls - both positive and negative?
How will you collect your data?
How will you present your data (charts, graphs, types)?
How will you analyze your data? Observations
1. A plant grows three inches faster per day when placed on a window sill than it does
when placed on a on a coffee table in the middle of the living room.
©eScience Labs, LLC 2014 2. The teller at the bank with brown hair and brown eyes is taller than the other tellers. Cannot be tested accurately.
3. When Sally eats healthy foods, her blood pressure is 10 points lower than when she
eats fatty foods.
4. The Italian restaurant across the street closes at 9 pm but the one two blocks away
closes at 10 pm. Cannot be tested accurately.
5. For the past two days, the clouds have come out at 3 pm and it has started raining at
3:15 pm.
6. George did not sleep at all the night following the start of daylight savings. Cannot be tested accurately Exercise 4: Conversion
For each of the following, convert each value into the
designated units. 1. 46,756,790 mg = __40,7568_____ kg
2. 5.6 hours = __20160______ seconds
3. 13.5 cm = __5.314961______ inches
4. 47 °C = __116.6_____ °F ©eScience Labs, LLC 2014

 

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