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2. Dr. Ana wants to investigate the effect that nitrogen has on the growth of the...

2. Dr. Ana wants to investigate the effect that nitrogen has on the growth of the Zephyranthes puertoricensis plant. According to Dr. Ana, an experiment can be performed using various concentrations of nitrogen. Therefore, in this experiment, nitrogen is a variable. What type of variable is it? (choose the best answer)

a. Dependent variable
b. Independent variable
c. Control variable
d. Variable witness

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Answer #1

Answer- option a –independant variable

An independent variable can be altered or manipulated in an experiment and the dependant variable varies accordingly. Nitrogen concentration is changed or varied in this example .

A dependant variable is the one which is tested or measured . In this case it would be growth of the plant. The dependant variable depends on independent variable. Change in nitrogen concentration changes growth rates .

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