A series of experiments was designed to test the effects of ultraviolet (UV) radiation on the productivity of polar phytoplankton. Samples of these single-celled organisms were placed in four tanks, which were exposed to ambient natural solar radiation and to three modifications of ambient radiation. The design of the experiments is shown in the table below, along with measurements of photosynthesis in each tank. Which of the following inferences is supported by the results of this series of experiments? A)The atmosphere over Antarctica still contains some ozone. B)Doubling of UV radiation will suppress photosynthesis completely. C)The ozone hole over Antarctica is being destroyed by chlorofluorocarbons (CFCs). D)Increased UV penetration through the Antarctic ozone hole would further depress productivity of phytoplankton. E)Higher levels of UV radiation will eventually occur over Antarctica.
A series of experiments was designed to test the effects of ultraviolet (UV) radiation on the productivity of polar
phytoplankton. Samples of these single-celled organisms were placed in four tanks, which were exposed to ambient
natural solar radiation and to three modifications of ambient radiation. The design of the experiments is shown in
the table below, along with measurements of photosynthesis in each tank.
Which of the following inferences is supported by the results of this series of experiments?
A)The atmosphere over Antarctica still contains some ozone.
B)Doubling of UV radiation will suppress photosynthesis completely.
C)The ozone hole over Antarctica is being destroyed by chlorofluorocarbons (CFCs).
D)Increased UV penetration through the Antarctic ozone hole would further depress productivity of
phytoplankton.
E)Higher levels of UV radiation will eventually occur over Antarctica.
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