Sulphur dioxide is toxic to plant at or above

A. 0.1 - 0.3 ppm

B. 0.3 - 0.5 ppm

C. 0.5 - 0.6 ppm

D. 0.7 - 0.9 ppm

Answer: Option B

Solution(By Examveda Team)

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.