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 11
A researcher is testing the effect of pH on the rate of photosynthesis in algae. What is the dependent variable?
A scientist is investigating the effect of water temperature on the rate at which a chemical reaction occurs. What is the dependent variable?
A scientist is testing the effect of salt concentration on the rate of osmosis in potato cells. What is the independent variable?
A student investigates the effect of sugar concentration on yeast respiration rate. What is the dependent variable?
A researcher is testing the effect of pH on the rate of photosynthesis in algae. What is the dependent variable?
A scientist is investigating the effect of water temperature on the rate at which a chemical reaction occurs. What is the dependent variable?
A scientist is testing the effect of salt concentration on the rate of osmosis in potato cells. What is the independent variable?
A student investigates the effect of sugar concentration on yeast respiration rate. What is the dependent variable?
Which of the following best defines an independent variable in a scientific experiment? (1) The variable that is measured, (2) The variable that is changed or controlled by the experimenter, (3) The variable that remains constant, (4) The variable that is affected by other variables
Which of the following best describes a controlled variable? (1) It is changed by the experimenter, (2) It is measured as the outcome, (3) It is kept constant to ensure a fair test, (4) It is not important in an experiment
Which of the following is an example of a controlled variable in an experiment testing the effect of light color on photosynthesis? (1) Light color, (2) Amount of water, (3) Rate of photosynthesis, (4) Plant species
Which of the following is an example of a dependent variable? (1) The type of fertilizer used, (2) The height of the plant, (3) The amount of sunlight, (4) The type of soil
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 deliberately changed is the __________ variable.
Fill in the blank: The variable that is measured in response to changes in the independent variable is the __________ variable.
Fill in the blank: The variable that is observed and expected to change as a result of the independent variable is called the __________ variable.
Is it important to control variables in an experiment? Yes or No.
True or False: Controlled variables are also known as constants.
True or False: The dependent variable is also called the output variable.
True or False: The dependent variable is the variable that the experimenter manipulates.
