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UPSC 2023: 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?
(a)Only one
(b)Only two
(c)All three
(d)None
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Not attemptedCorrect Answer: (b) Only two
Biofilters in recirculating aquaculture systems host nitrifying bacteria that oxidize toxic ammonia (NH3) to nitrate (NO3−), but solid wastes such as uneaten feed are removed by mechanical filters, and biofilters do not raise phosphorus levels. Hence, only statement 2 is correct. ([edukemy.com](https://edukemy.com/blog/upsc-prelims-2023-question-55/?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 2023 Science & Technology question?▼
The correct answer is option (b): Only two. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Energy & Environment question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2023, GS Paper 1, as Question 55. It falls under Science & Technology > Energy & Environment.
What is the difficulty level of this UPSC question?▼
This question is rated "moderate". It requires sound conceptual understanding of the topic.
How many UPSC Prelims questions have been asked from Energy & Environment?▼
UPSC has asked 48 questions from Energy & Environment (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.