The Ratio Between the Uptake of Carbon Dioxide by Photosynthesis

Multiple Choice

The ratio between the uptake of carbon dioxide by photosynthesis and the release of carbon dioxide by respiration is approximately

A) 1 (i.e., about the same) .
B) 2 (i.e., twice as much carbon dioxide is taken up by photosynthesis as is released by respiration) .
C) 5 (i.e., five times as much carbon dioxide is taken up by photosynthesis as is released by respiration) .
D) 0.5 (i.e., half as much carbon dioxide is taken up by photosynthesis as is released by respiration) .
E) 0.1 (i.e., one-tenth as much carbon dioxide is taken up by photosynthesis as is released by respiration) . The transfer rates of these two is about even.