# UMUC Biology 102/103 Lab 1: Introduction to Science New Work

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UMUC Biology 102/103 Lab 1: Introduction to Science NEW

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?

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.

3. What would your experimental approach be to test this hypothesis?

4. What would be the independent and dependent variables?

5. What would be your control?

6. What type of graph would be appropriate for this data set? Why?

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

Exercise 3: Testable Observations

Determine which of the following observations are testable. For those that are testable:

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?

Exercise 4: Conversion

For each of the following, convert each value into the designated units.

1. 46,756,790 mg = _______ kg

1. 6 hours = ________ seconds

1. 5 cm = ________ inches

1. 47 °C = _______ °F

Exercise 5: Accuracy vs. Precision

For the following, determine whether the information is accurate, precise, both or neither.

Exercise 6: Significant Digits and Scientific Notation

Part 1: Determine the number of significant digits in each number and write out the specific significant digits.

Part 2: Write the numbers below in scientific notation, incorporating what you know about significant digits.

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