Variables in Experiments
Biology ⇒ Scientific Inquiry and Experimental Design in Biology
Variables in Experiments starts at 6 and continues till grade 12.
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See sample questions for grade 12
A researcher is testing the effect of caffeine on heart rate in mice. List one possible controlled variable.
A researcher wants to test the effect of different water temperatures on the rate of fish respiration. List one controlled variable for this experiment.
A scientist is testing the effect of pH on bacterial growth. What is the independent variable?
A scientist is testing the effect of salt concentration on the rate of osmosis in potato cells. What is the independent variable?
A researcher is testing the effect of caffeine on heart rate in mice. List one possible controlled variable.
A researcher wants to test the effect of different water temperatures on the rate of fish respiration. List one controlled variable for this experiment.
A scientist is testing the effect of pH on bacterial growth. What is the independent variable?
A scientist is testing the effect of salt concentration on the rate of osmosis in potato cells. What is the independent variable?
Which of the following best defines an independent variable in a biological experiment? (1) The variable that is measured, (2) The variable that is manipulated, (3) The variable that remains constant, (4) The variable that is ignored
Which of the following best describes a confounding variable? (1) A variable that is intentionally changed, (2) A variable that is measured, (3) A variable that influences both the independent and dependent variables, (4) A variable that is kept constant
Which of the following is a reason to use randomization in assigning variables in an experiment? (1) To increase bias, (2) To reduce the effect of confounding variables, (3) To make the experiment more difficult, (4) To increase the number of variables
Which of the following is an example of a controlled variable in an experiment testing the effect of pH on enzyme activity? (1) pH, (2) Enzyme concentration, (3) Reaction time, (4) Substrate concentration
Fill in the blank: In a controlled experiment, the group that does not receive the independent variable is called the __________ group.
Fill in the blank: In a fair test, only the __________ variable should affect the dependent variable.
Fill in the blank: The variable that is intentionally changed to test its effect is the __________ variable.
Fill in the blank: The variable that is kept the same in all groups of an experiment is called a __________ variable.
True or False: Controlled variables are also known as constants.
True or False: If more than one independent variable is changed at a time, it is easy to determine which variable caused the observed effect.
True or False: In a well-designed experiment, only one independent variable should be tested at a time.
True or False: The dependent variable is always plotted on the x-axis of a graph.
