Importance of Controls – Biology

Importance of Controls – Biology in the News Part 2

Directions for Part 2

This discussion assignment is worth 10 of the 30 total points given for the assignment, “Biology in the News”.  This portion of the “Biology in the News” assignment will be completed after you have submitted the original assignment.

Using the article you analyzed for “Biology in the News” summarize the following points:

  • What were the results that were obtained (from the experimental system used)?
  • What were the controls that were used (which variables were kept constant?)
  • What was the purpose for using those specific controls (what does it rule out?)

It’s likely that the controls were not explicitly mentioned in the article, but make an educated guess as to what they would be.  A good hint would also be to look at the journal abstract of the article.

Please be sure your chosen article is an EXPERIMENT. A “study” is often just observational, and no controls are set.

Review BOTH resources below to understand Controls:

Here is a link to information about controlled experiments (Links to an external site.) as presented by the Khan Academy.

Review this power point presentation on The Scientific Method

More helpful information about controls:

How do I determine the controls in the article I chose?  Here is some information to help you:

Let’s suppose you are studying birds and want to learn about their feeding habits. Questions you have may include:

  • What time of day do the birds most often come to the feeder?
  • What time of the year do birds most often come to the feeder?
  • What type of food do the birds prefer (given a finite number of types)?
  • Where do birds prefer the feeder to be located?

And there are probably more you can think of. BUT, scientists only set up an experiment to answer ONE question at a time. ALL the other conditions must remain the same. We call those CONTROLS. We can’t accurately come to a conclusion if there is more than one variable at a time.

Take a look at the experimental design chart below. Without any other information, can you tell what variable and controls are set?

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