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B
Water
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C
Soil
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D
Nostoc
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Solution
The correct option is A Air The photochemical reaction is caused by absorption of energy in the form of light. The word smog is formed of smoke and smog. Photochemical smog is the major contributor to air pollution and is composed of primary and secondary pollutants. Primary being the nitrogen oxides and volatile organic compounds released by vehicular emission and industries, secondary include ozone which forms as the reaction of primary pollutants with UV rays. These substances are highly reactive and adversely impact the environment, human and animal life. Many skin disease, lung disease, the headache can be associated with the photochemical smog.