Use of synthetic fertilizers often leads to the contamination of groundwater with nitrates. Nitrate pollution is also a suspected cause of anoxic "dead zones" in the ocean. Which of the following might help reduce nitrate pollution?
A) growing improved crop plants that have nitrogen-fixing enzymes
B) adding nitrifying bacteria to the soil
C) adding denitrifying bacteria to the soil
D) using ammonia instead of nitrate as a fertilizer

Question

Quizplus · Accepted Answer

Growing improved crop plants that have nitrogen-fixing enzymes can reduce the need for synthetic fertilizers, resulting in less nitrate pollution. Nitrogen-fixing enzymes allow plants to obtain nitrogen from the atmosphere, which can be used to synthesize organic molecules. This reduces the need for nitrogen fertilizers and reduces nitrate pollution. Options B and C add bacteria to the soil, but it is not guaranteed that they will reduce nitrate pollution. Option D is not a suitable solution as ammonia can also lead to nitrate pollution.

Use of Synthetic Fertilizers Often Leads to the Contamination of Groundwater