With reference to the role of biofilters in Recirculating Aquaculture System, consider the following…

With reference to the role of biofilters in Recirculating Aquaculture System, consider the following statements: 1. Biofilters provide waste treatment by removing uneaten fish feed. 2. Biofilters convert ammonia present in fish waste to nitrate. 3. Biofilters increase phosphorus as nutrient for fish in water. How many of the statements given above are correct?
  1. Only one
  2. Only two
  3. All three
  4. None

Solution

Per the official UPSC key, the answer is D. Statement 2 — biofilters nitrify ammonia to nitrate — is correct; most coaching keys marked A.

Asked in: UPSC Prelims 2023

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