Question

the passage below describes an experiment. read the passage and think about the variables that are described. jared wanted to grow cucumbers from seeds. he read that using a heating pad to heat up potting soil could help make seeds germinate, or sprout, faster. jared wondered whether the temperature of the heating pad would affect how quickly the seeds germinated. jared prepared two potting trays, each made up of ten small pots of soil. he planted one cucumber seed in each small pot and arranged the potting trays near a sunny window. he set an electric heating pad to 75°f and placed it under one potting tray. he set a second heating pad to 85°f and placed it under the other potting tray. jared observed the pots daily, and he counted the number of days it took until a seed germinated in each pot. which of the following was an independent variable in this experiment? hint: an independent variable is a variable whose effect you are investigating. a dependent variable is a variable that you measure. the temperature of the heating pad the number of days until a seed germinated

Explanation:

An independent variable is what is changed or controlled in an experiment to test its effect on the dependent variable. Jared is changing the temperature of the heating pad to see how it affects seed - germination time. The number of days until a seed germinated is what he measures (dependent variable).

Answer:

the temperature of the heating pad