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This question belongs to Agriculture Plant Pathology
Plant Pathology
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Sulphur dioxide is toxic to plant at or above

Answer & Solution
Correct Answer: Option B
Sulphur dioxide is toxic to plants at or above 0.3 - 0.5 ppm.
Sulphur dioxide is a colourless gas at ambient temperature and pressure. It can be detected by taste at concentrations of 0.35 - 1.05 ppm and has a pungent, irritating odour with an odour threshold of 0.67 - 4.75 ppm.
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