Which of the followings is true? DDT levels can increase in larger fishes and bi

Question

Which of the followings is true? DDT levels can increase in larger fishes and birds due to bio magnification. DDT is made of organic carbon, so will naturally decay in streams and rivers. Streams polluted by inflow of untreated sewers will be naturally purified by large fishes as they eat organic carbons in the sewers. In a stream, bacteria needs more dissolved oxygen than fishes. Which of the following statements is not true? Nitrogen gas in the air is fixed to produce ammonia. Ammonia is used to produce nitrogen fertilizer. In water, ammonium becomes nitrate by oxidation. Dissolution of minerals can increase nitrate concentrations in streams.

Explanation / Answer

DDT is made of organic carbon,so will naturally decay in streams and rivrs is true of the following statement.

Dissolution of minerals can increase nitrate concentrations in streams is not true for the following statements.

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