Astudent wants to test the hypothesis that fertilizer improves the growth rate of grass seeds. to test this hypothesis, the student put the same amount of grass seed in 3 containers with the same type of soil. the student measured the growth at the end of the week. all plants received equal amounts of water and sunlight what is the dependant variable

Growth rate of the grass seeds.

Explanation:

The growth rate is the dependent variable in the experiment because the growth rate of the plants is dependent on the fertilizers. The factor that cannot be changed by the experimenter is known as dependent variable and it is dependent on the independent variables.

The students wants to see the effect of the fertilizers on the growth of the plants.  The fertilizer is independent variable which can be changed by the experimenter.

The plants growth depends on many factors, these factors are fertilizers, amount of light, amount of water, et cetera.

Excluding fertilizers rest of the factors are kept same and are controlled factors.