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 10
A researcher wants to test the effect of pH on enzyme activity. List one possible controlled variable.
A scientist wants to test the effect of temperature on the rate of enzyme activity. What is the dependent variable?
A student investigates the effect of different types of music on plant growth. Identify the independent, dependent, and one controlled variable.
A student investigates the effect of salt concentration on the rate of osmosis in potato slices. Identify the independent and dependent variables.
A researcher wants to test the effect of pH on enzyme activity. List one possible controlled variable.
A scientist wants to test the effect of temperature on the rate of enzyme activity. What is the dependent variable?
A student investigates the effect of different types of music on plant growth. Identify the independent, dependent, and one controlled variable.
A student investigates the effect of salt concentration on the rate of osmosis in potato slices. Identify the independent and dependent variables.
Which of the following best describes a dependent variable? (1) The variable that is changed by the experimenter, (2) The variable that is measured or observed, (3) The variable that remains constant, (4) The variable that is not recorded
Which of the following best describes a fair test in an experiment? (1) Changing all variables, (2) Changing only the dependent variable, (3) Changing only the independent variable while keeping others constant, (4) Not measuring any variables
Which of the following is an example of a controlled variable in an experiment testing the effect of light on photosynthesis? (1) Amount of water, (2) Light intensity, (3) Rate of photosynthesis, (4) Type of plant
Which of the following is an example of an independent variable? (1) The amount of sunlight plants receive, (2) The height of the plants, (3) The type of soil used, (4) The temperature of the room
Fill in the blank: In a fair test, only the __________ variable should be changed at a time.
Fill in the blank: In a scientific experiment, the variable that is being tested is the __________ variable.
Fill in the blank: In an experiment, the variable that is observed and expected to change as a result of the independent variable is the __________ variable.
Fill in the blank: The variable that is deliberately changed in an experiment is called the __________ variable.
True or False: A controlled variable is a variable that is kept the same throughout the experiment.
True or False: Changing more than one variable at a time makes it difficult to determine which variable caused the observed effect.
True or False: Controlled variables can affect the results of an experiment if they are not kept constant.
True or False: In a well-designed experiment, all variables except the independent variable should be controlled.
