Lab 1 - Worksheet-2
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BIO 112L: Exploration of Biological Phenomena Laboratory
Lab 1: Scientific Method
Worksheet
Module 2
Due Date: Sunday, February 11 due by 11:59 p.m EST.
Point Value: 10 points
Directions
After finishing the Scientific Method course, please answer the following questions. Once you have completed it, save your worksheet as a PDF and upload it in Lab 1 - Assignment
in Module 2.
Questions
1.
List the steps to the scientific Method. (1 point)
2.
What is a hypothesis? (1 point)
3.
What is an experiment? (1 point)
4.
Select the best hypothesis for the following observation: You notice that a freshwater pond freezes over more easily than the ocean in the winter. (1 point)
A.
The ocean’s large size creates an invisible force which breaks up any ice that forms.
B.
Fresh water freezes at a higher temperature than salt water.
C.
People float more easily in salt water than in freshwater.
D.
Fresh water freezes at lower temperature than salt water.
5.
Which of the following would be an effective experiment to test whether freshwater freezes at a higher temperature than salt water? (1 point)
A.
Note the air temperature each day and record whether the pond is frozen and whether the ocean is frozen. B.
Physically isolate an area of ocean water that is the size of the freshwater pond and measure air temperature and whether each body of water is frozen.
C.
Using distilled water (water with no salt) and water with salt dissolved in it, try to freeze both samples in a freezer at several different temperatures and observe whether freshwater freezes at higher temperatures.
Name: D.
Use a large barrier to eliminate the current and waves in the ocean to ensure that these conditions are identical with those in the pond and then measure air temperature and whether each body of water is frozen.
6.
You observe that the roots of plants grow towards water. Choose the hypothesis that best explains this observation based on your knowledge of plant growth. (1 point)
A.
Water might emit a strong odor that plants can sense, allowing them to grow in the direction where the odor is strongest
B.
Plant roots sense water and can grow in the direction of a moisture gradient.
C.
Plants can sense the sound of water trickling and grow in that direction.
D.
Plant roots are attracted to the reflection of sunlight off water and grow in that direction.
7.
In any unbiased experiment, the researcher manipulates only one variable and measures its effects on a dependent variable. Which variable is manipulated? (1 point)
8.
What does a control group provide in an experiment? (1 point)
9.
What is a negative control in an experiment? (1 point)
10. What is a positive control in an experiment? (1 point)
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14 ▾ BIU A A-
EEEE VE
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THE FARMER AND THE FLY: PART I
Directions:
Read each part of the scenario
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Scenario part I.
A farmer was working with chickens at an agricultural research station. The population of
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