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Scientific
Method Worksheet
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- Directions: Read the following story, then
follow the directions below.
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- A marine biologist conducted a study of the ability
of vertebrate blood to carry oxygen. He believed that
a low environmental temperature would cause the organism's
blood to carry less oxygen than blood at a higher
temperature. The following reflects the scientists
experiment and the data he collected.
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- Two tanks of salt water, each containing 25 gallons,
was set up in the lab.
- Each tank was filled with the same types of organisms
( perch and salmon ).
- The same type of aerators were added to each tank
to supply dissolved oxygen to the fish.
- To one of the tanks, marked TANK A, the temperature
was decreased at increments of 5 degrees C every 20
minutes.
- The second tank, marked TANK B, the temperature
is raised at increments of 5 degrees C every 20 minutes.
- Blood was removed from each of the fish and measured
for its oxygen content.
- Below is the results from the above experiment.
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Temperature in Degrees C
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Amount of Dissolved Oxygen found in fish
in Tank A -ml/g
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Temperature in Degrees C
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Amount of Dissolved Oxygen found in
fish in Tank B -ml/g
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25
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35
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25
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35
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20
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30
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30
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32
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15
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23
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35
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39
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10
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12
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40
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35
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5
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8
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45
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20
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- 1. What is the hypothesis of the above experiment?
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- 2. Is the above experiment a controlled experiment?
_____________________________________________________________________________
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- 3. Explain your answer to question 2. _____________________________________________________________________________
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- _____________________________________________________________________________
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- 4. What term would be used to denote a person who
studies blood? _____________________________________________________________________________
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- 5. What is the variable
factor in the above experiment? _____________________________________________________________________________
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- Line Graph the above data and then answer the questions
that follow.
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- TITLE: _____________________________________________________________________
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Click on paper if you need to print graph paper.
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- Legend: ____________________________________________________________________________
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- 6. What is the dependent
variable? ____________________________________________________________________________
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- 7. What is the independent
variable? ____________________________________________________________________________
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- 8. Based on the above data, is the scientists hypothesis
correct? ____________________________________________________________________________
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- 9. What are the controls used in the above experiment?__________________________________________________________________
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- _____________________________________________________________________________
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- _____________________________________________________________________________
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