Given two areas with equal sunlight and available water. Area I has a high amount of atmospheric carbon dioxide while Area II has a low amount of atmospheric carbon dioxide.

How does the rate of photosynthesis in Area I compare to that in Area II?
A) Atmospheric carbon dioxide has no affect on the rate of photosynthesis.
B) The rate of photosynthesis increases with a decrease in carbon dioxide.
C) The rate of photosynthesis increases with an increase in carbon dioxide.
D) The level of carbon dioxide increases with the level of available oxygen

The rate of carbon dioxide influences the rate of photosynthesis in plants. With increased amount of carbon dioxide available, as a substrate required for photosynthesis, the rate of photosynthesis will increase to produce an increase amount of oxygen as the product of photosynthesis.

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