In Part I of this experiment, the

was intentionally manipulated. This was the independent variable. The dependent variable measured was the
.

In Part II of this experiment, the
was intentionally manipulated. This was the independent variable. The dependent variable measured was the
.

In Part I of this experiment, the temperature was intentionally manipulated. This was the independent variable. The dependent variable measured was the growth rate of the plants.

In Part II of this experiment, the amount of light was intentionally manipulated. This was the independent variable. The dependent variable measured was the rate of photosynthesis.