Jeff is investigating factors that affect the growth rate of potted bean plants. Which of the following experimental variables would not be relevant to his investigation?
A. the type of soil used
B. the amount of light exposure
C. the amount of water given
D. the color of the pot
The color of the pot has no effect on plant growth. The type of soil used (the nutrients present, for example), the amount of light exposure (for photosynthesis), and the amount of water given all affect plant growth.
