We get a typical, strong odour at public urinals and cattle sheds.

Ans.

1. The urine of animals (including human beings) contains many nitrogenous compounds.
2. The bacterial decomposition of these nitrogenous compounds produces ammonia.
3. Ammonia has a strong, pungent and irritating odour.
4. Hence, we get a typical, strong odour at public urinals and cattle sheds.