In an investigation into the role of plants in the cycling of matter, a researcher is designing an experiment in which plants will be grown under conditions that will limit the rate of photosynthesis. Which design would match the goal of the researcher? A.
Grow the plants in a low oxygen environment and measure the rate of carbon dioxide production.

B.
Grow the plants in a low carbon dioxide environment and measure the rate of oxygen production.

C.
Grow the plants in soil containing excess water and measure the rate of transpiration.

D.
Grow the plants in soil containing excess nitrogen and measure the rate of plant growth.