Day 9 of 30
Control variables and control groups
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Learning Objective
Students will be able to explore control variables and control groups.
In this lesson, we'll explore control variables and control groups. Scientific inquiry allows us to investigate and explain natural phenomena.
Control variables are factors you keep the same in an experiment so they don't affect the results. A control group is the standard for comparison—it doesn't get the treatment you're testing. For example, testing fertilizer on plants: control variables = same water, light, soil; control group = plants with no fertilizer. Comparing the treatment group (with fertilizer) to the control group shows if the fertilizer made a difference. Controls make experiments fair!
As you work through today's material, pay attention to the examples and try to identify the patterns or strategies being used. This will help you apply these concepts to new problems.
Take notes on key points and make connections to what you've already learned in previous lessons.
To examine systematically through observation and experiment
Observable facts that support or refute a claim
Instructions
Materials Needed
- Lab notebook
- Investigation materials
- Safety equipment if needed
Based on today's lesson, what is one thing you observed or learned?
How could you test or investigate this topic further?
Why is this topic important in the real world?
Teaching Tip
For this age group: Balance direct instruction with collaborative activities. Allow students to explain their thinking and make connections to prior knowledge when exploring control variables and control groups.