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					                                                                                            Name:_________________________
                                                                                            Block:_________________________

                                                 Designing an Experiment
Introduction:
The scientific method is a procedure used to gather information and test ideas. Scientists use the scientific method to answer
questions about life and living organisms. Experimentation is an important part of the scientific method. In order to ensure that the
results of an experiment are due to the variable being tested, a scientist must have both an experimental setup and a control setup.
The experimental setup and the control setup differ only in the variable being tested.
In this investigation, you will form a hypothesis, test it, and draw a conclusion based on your observations.

Question:
Is light necessary for mold growth on white bread?

Pre-Investigation Discussion and Research:
Read the entire investigation. Then, work with your group to answer the following questions.
1. Under what conditions does mold usually grow?


2. Why is it important to close plastic bags containing some type of food?


3. What evidence will tell you whether or not light is necessary for mold growth?



Materials:
1 slice of white bread cut in half
2 plastic bags
2 paper towels
Pinch of soil

Hypothesis:
With the members of your group, discuss whether or not the bread needs light to grow mold. Based on your discussion, record your
hypothesis in the space provided below.
(Remember a hypothesis is a statement that one can test.)




Experiment:
An experiment is the process of testing a hypothesis. The things that have an effect on the experiment are called variables. There
are three kinds of variables that you need to identify in your experiment: independent, dependent, and controlled.

The independent variable is the variable you purposely manipulate (change). The dependent variable is the variable that is being
observed, which changes in response to the independent variable. The variables that are not changed are called controlled
variables.




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*Design an experiment, using the materials above, that includes independent, dependent, and controlled variables as well as
answering your hypothesis.
(Note that when designing the experiment, you must include steps for measuring the results. For example, to measure the amount of
mold growth, you might draw 1cm squares on the plastic bags.)
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Data:
Record data here




Analysis and Conclusion:
1. Did more bread mold grow in the light or in the dark?


2. What were the controlled variables in this investigation?


3. What was the dependent variable in the experiment?


4. What was the independent variable?


5. What conclusions can you draw from this controlled experiment?


6. How does your hypothesis compare with your results after completing the investigation?


7. Why was it important to keep both the control setup and the experimental setup at the same temperature during the
experiment?




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posted:12/17/2011
language:English
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