Multiple choice general knowledge science & technology

A gas used as a fertilizer is:

  1. NH3

  2. CO

  3. O3

  4. CO2
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A Correct answer
Explanation

Ammonia (NH3) is widely used as a fertilizer because it contains nitrogen, an essential nutrient for plant growth. NH3 can be directly applied to soil or used to produce other nitrogen fertilizers like urea. The other options (CO, O3, CO2) are not used as fertilizers - CO is toxic, O3 is an air pollutant at ground level, and CO2 is not a direct fertilizer though plants need carbon.

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