Discussion
Assertion [A] : Overloading of Nitrogen in the environment can cause an imbalance to the natural nitrogen cycle.
Reason [R] : Nitrogen becomes a pollutant when it escapes into the environment and reacts with other organic compounds.
Answer: A
The official final key is (A): [A] is true but [R] is false. Over-supply of reactive nitrogen (from fertilisers and combustion) does upset the natural nitrogen cycle, so [A] is true.
The reason is faulty because reactive nitrogen becomes a pollutant mainly as nitrate, ammonia and nitrogen oxides in water and air, not by reacting with "other organic compounds". The pen tick on the booklet marked (B), the tentative answer, which the final key changed.
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