Multiple choice

Which of the following statement is not true? (stem is negative, thus distracters should not be negative)

  1. Threshing & winnowing cause air pollution

  2. Paper and food industry does not cause air pollution

  3. Germinating electricity through down does not cause air pollution

  4. Pollen grains and spores are natural source of air pollution
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Paper and food industry also release hydrocarbons and other harmful gases in air.

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