Sulphur dioxide is the major air pollutant released from the vehicular emissions, industrial emissions, smelting of the sulphide ores etc. It has a deleterious effect on the leaves of the plants. It causes bleaching of the chlorophyll pigment resulting in the chlorosis, inward curling of the leaves along the margins, premature fall etc.
A. CO causes premature abscission and yellowing of the leaves.
B. H2S causes defoliation.
C. O3 causes the hindrance in the mitochondrial function.
Hence, the correct answer is 'SO2'
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