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 6
Describe what a controlled variable is and give one example.
Describe why it is important to identify all variables in an experiment before starting.
Explain the difference between an independent variable and a dependent variable.
If you are testing how the amount of fertilizer affects the number of tomatoes produced by a plant, what is the dependent variable?
If you are testing how the amount of fertilizer affects the number of tomatoes produced by a plant, what is the dependent variable?
In an experiment testing the effect of temperature on the rate of a chemical reaction, what is the dependent variable?
In an experiment to see if fertilizer affects plant height, what should be kept as controlled variables? (1) Type of plant (2) Amount of sunlight (3) Amount of water (4) All of the above
In an experiment to test how sunlight affects plant growth, what is the independent variable?
In an experiment to see if fertilizer affects plant height, what should be kept as controlled variables? (1) Type of plant (2) Amount of sunlight (3) Amount of water (4) All of the above
In an experiment to test if music affects plant growth, what is the independent variable? (1) Type of plant (2) Amount of water (3) Type of music played (4) Height of plant
In an experiment, which variable is also called the manipulated variable? (1) Dependent variable (2) Independent variable (3) Controlled variable (4) Random variable
Which of the following best describes a dependent variable? (1) The variable you change (2) The variable you measure (3) The variable you keep the same (4) The variable you ignore
Fill in the blank: In a fair test, only the __________ variable should be changed.
Fill in the blank: In an experiment, the variable that is kept the same is called the __________ variable.
Fill in the blank: In an experiment, the variable that the scientist changes is the __________ variable.
Fill in the blank: The variable that is changed by the experimenter is called the __________ variable.
True or False: Changing more than one variable at a time makes it difficult to know which variable caused the results.
True or False: Controlled variables can affect the outcome of an experiment if they are not kept constant.
True or False: The dependent variable is the one that is measured in an experiment.
True or False: The dependent variable is the variable that the scientist changes on purpose.
