Multiple choice

In plants, necrotic blotching is caused by

  1. CO2

  2. SO2

  3. NO

  4. H2S

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

SO2 is poisonous and irritates the respiratory system of animals and humans. A continuous exposure to concentration of 0.2 ppm lasting for 3-4 days or even 0.5 ppm for full day has been reported to damage the lungs and increase the rate of mortality. In plants and grasses, SO2 also produces leaf injuries, called necrotic blotching. Sulphur dioxide damages barley, alfalfa, cotton and wheat.

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