{"id":92101,"date":"2025-06-01T11:13:56","date_gmt":"2025-06-01T11:13:56","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=92101"},"modified":"2025-06-01T11:13:56","modified_gmt":"2025-06-01T11:13:56","slug":"with-reference-to-the-role-of-biofilters-in-recirculating-aquaculture","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/with-reference-to-the-role-of-biofilters-in-recirculating-aquaculture\/","title":{"rendered":"With reference to the role of biofilters in Recirculating Aquaculture"},"content":{"rendered":"<p>With reference to the role of biofilters in Recirculating Aquaculture System, consider the following statements:<\/p>\n<ul>\n<li>1. Biofilters provide waste treatment by removing uneaten fish feed.<\/li>\n<li>2. Biofilters convert ammonia present in fish waste to nitrate.<\/li>\n<li>3. Biofilters increase phosphorus as nutrient for fish in water.<\/li>\n<\/ul>\n<p>How many of the statements given above are correct?<\/p>\n<p>[amp_mcq option1=&#8221;Only one&#8221; option2=&#8221;Only two&#8221; option3=&#8221;All three&#8221; option4=&#8221;None&#8221; correct=&#8221;option1&#8243;]<\/p>\n<div class=\"psc-box-pyq-exam-year-detail\">\n<div class=\"pyq-exam\">\n<div class=\"psc-heading\">This question was previously asked in<\/div>\n<div class=\"psc-title line-ellipsis\">UPSC IAS &#8211; 2023<\/div>\n<\/div>\n<div class=\"pyq-exam-psc-buttons\"><a href=\"\/pyq\/pyq-upsc-ias-2023.pdf\" target=\"_blank\" class=\"psc-pdf-button\" rel=\"noopener\">Download PDF<\/a><a href=\"\/pyq-upsc-ias-2023\" target=\"_blank\" class=\"psc-attempt-button\" rel=\"noopener\">Attempt Online<\/a><\/div>\n<\/div>\n<section id=\"pyq-correct-answer\">\nThe correct option is A, indicating that only one of the given statements is correct.<br \/>\n<\/section>\n<section id=\"pyq-key-points\">\nRecirculating Aquaculture Systems (RAS) use biofilters as a key component for water treatment.<br \/>\nStatement 1 is incorrect. Biofilters primarily treat dissolved waste products, particularly nitrogenous compounds. Solid wastes, such as uneaten fish feed and feces, are typically removed by mechanical filters (like drum filters or settling tanks) *before* the water reaches the biofilter. While the decomposition of uneaten feed *produces* substances that the biofilter treats, the biofilter itself does not remove the solid feed.<br \/>\nStatement 2 is correct. The main function of a biofilter in RAS is nitrification, which is the biological process where beneficial bacteria convert toxic ammonia (excreted by fish and from decomposition) first into nitrite and then into much less toxic nitrate. This is essential for maintaining water quality suitable for fish.<br \/>\nStatement 3 is incorrect. Biofilters are designed to remove or convert waste products, not increase nutrients for fish. While phosphorus is present in fish feed and waste, biofilters are primarily focused on managing nitrogen. Systems for nutrient addition for fish involve providing high-quality feed, not manipulating waste products in the water circuit.<br \/>\n<\/section>\n<section id=\"pyq-additional-information\">\nRAS significantly reduces water usage compared to traditional aquaculture by recycling water. Effective biofiltration is crucial for removing metabolic wastes and maintaining a healthy environment for the fish. Other components of RAS often include mechanical filtration, oxygenation\/aeration, pH control, and temperature control.<br \/>\n<\/section>\n","protected":false},"excerpt":{"rendered":"<p>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? [amp_mcq &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"With reference to the role of biofilters in Recirculating Aquaculture\" class=\"read-more button\" href=\"https:\/\/exam.pscnotes.com\/mcq\/with-reference-to-the-role-of-biofilters-in-recirculating-aquaculture\/#more-92101\">Detailed Solution<span class=\"screen-reader-text\">With reference to the role of biofilters in Recirculating Aquaculture<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1092],"tags":[1105,1434,1117],"class_list":["post-92101","post","type-post","status-publish","format-standard","hentry","category-upsc-ias","tag-1105","tag-biofertilizers","tag-biology","no-featured-image-padding"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.2 (Yoast SEO v23.3) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>With reference to the role of biofilters in Recirculating Aquaculture<\/title>\n<meta name=\"description\" content=\"The correct option is A, indicating that only one of the given statements is correct. Recirculating Aquaculture Systems (RAS) use biofilters as a key component for water treatment. Statement 1 is incorrect. Biofilters primarily treat dissolved waste products, particularly nitrogenous compounds. Solid wastes, such as uneaten fish feed and feces, are typically removed by mechanical filters (like drum filters or settling tanks) *before* the water reaches the biofilter. While the decomposition of uneaten feed *produces* substances that the biofilter treats, the biofilter itself does not remove the solid feed. Statement 2 is correct. The main function of a biofilter in RAS is nitrification, which is the biological process where beneficial bacteria convert toxic ammonia (excreted by fish and from decomposition) first into nitrite and then into much less toxic nitrate. This is essential for maintaining water quality suitable for fish. Statement 3 is incorrect. Biofilters are designed to remove or convert waste products, not increase nutrients for fish. While phosphorus is present in fish feed and waste, biofilters are primarily focused on managing nitrogen. Systems for nutrient addition for fish involve providing high-quality feed, not manipulating waste products in the water circuit.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/exam.pscnotes.com\/mcq\/with-reference-to-the-role-of-biofilters-in-recirculating-aquaculture\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"With reference to the role of biofilters in Recirculating Aquaculture\" \/>\n<meta property=\"og:description\" content=\"The correct option is A, indicating that only one of the given statements is correct. Recirculating Aquaculture Systems (RAS) use biofilters as a key component for water treatment. Statement 1 is incorrect. Biofilters primarily treat dissolved waste products, particularly nitrogenous compounds. Solid wastes, such as uneaten fish feed and feces, are typically removed by mechanical filters (like drum filters or settling tanks) *before* the water reaches the biofilter. While the decomposition of uneaten feed *produces* substances that the biofilter treats, the biofilter itself does not remove the solid feed. Statement 2 is correct. The main function of a biofilter in RAS is nitrification, which is the biological process where beneficial bacteria convert toxic ammonia (excreted by fish and from decomposition) first into nitrite and then into much less toxic nitrate. This is essential for maintaining water quality suitable for fish. Statement 3 is incorrect. Biofilters are designed to remove or convert waste products, not increase nutrients for fish. While phosphorus is present in fish feed and waste, biofilters are primarily focused on managing nitrogen. Systems for nutrient addition for fish involve providing high-quality feed, not manipulating waste products in the water circuit.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/with-reference-to-the-role-of-biofilters-in-recirculating-aquaculture\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T11:13:56+00:00\" \/>\n<meta name=\"author\" content=\"rawan239\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"rawan239\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"With reference to the role of biofilters in Recirculating Aquaculture","description":"The correct option is A, indicating that only one of the given statements is correct. Recirculating Aquaculture Systems (RAS) use biofilters as a key component for water treatment. Statement 1 is incorrect. Biofilters primarily treat dissolved waste products, particularly nitrogenous compounds. Solid wastes, such as uneaten fish feed and feces, are typically removed by mechanical filters (like drum filters or settling tanks) *before* the water reaches the biofilter. While the decomposition of uneaten feed *produces* substances that the biofilter treats, the biofilter itself does not remove the solid feed. Statement 2 is correct. The main function of a biofilter in RAS is nitrification, which is the biological process where beneficial bacteria convert toxic ammonia (excreted by fish and from decomposition) first into nitrite and then into much less toxic nitrate. This is essential for maintaining water quality suitable for fish. Statement 3 is incorrect. Biofilters are designed to remove or convert waste products, not increase nutrients for fish. While phosphorus is present in fish feed and waste, biofilters are primarily focused on managing nitrogen. Systems for nutrient addition for fish involve providing high-quality feed, not manipulating waste products in the water circuit.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/exam.pscnotes.com\/mcq\/with-reference-to-the-role-of-biofilters-in-recirculating-aquaculture\/","og_locale":"en_US","og_type":"article","og_title":"With reference to the role of biofilters in Recirculating Aquaculture","og_description":"The correct option is A, indicating that only one of the given statements is correct. Recirculating Aquaculture Systems (RAS) use biofilters as a key component for water treatment. Statement 1 is incorrect. Biofilters primarily treat dissolved waste products, particularly nitrogenous compounds. Solid wastes, such as uneaten fish feed and feces, are typically removed by mechanical filters (like drum filters or settling tanks) *before* the water reaches the biofilter. While the decomposition of uneaten feed *produces* substances that the biofilter treats, the biofilter itself does not remove the solid feed. Statement 2 is correct. The main function of a biofilter in RAS is nitrification, which is the biological process where beneficial bacteria convert toxic ammonia (excreted by fish and from decomposition) first into nitrite and then into much less toxic nitrate. This is essential for maintaining water quality suitable for fish. Statement 3 is incorrect. Biofilters are designed to remove or convert waste products, not increase nutrients for fish. While phosphorus is present in fish feed and waste, biofilters are primarily focused on managing nitrogen. Systems for nutrient addition for fish involve providing high-quality feed, not manipulating waste products in the water circuit.","og_url":"https:\/\/exam.pscnotes.com\/mcq\/with-reference-to-the-role-of-biofilters-in-recirculating-aquaculture\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T11:13:56+00:00","author":"rawan239","twitter_card":"summary_large_image","twitter_misc":{"Written by":"rawan239","Est. reading time":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/exam.pscnotes.com\/mcq\/with-reference-to-the-role-of-biofilters-in-recirculating-aquaculture\/","url":"https:\/\/exam.pscnotes.com\/mcq\/with-reference-to-the-role-of-biofilters-in-recirculating-aquaculture\/","name":"With reference to the role of biofilters in Recirculating Aquaculture","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T11:13:56+00:00","dateModified":"2025-06-01T11:13:56+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"The correct option is A, indicating that only one of the given statements is correct. Recirculating Aquaculture Systems (RAS) use biofilters as a key component for water treatment. Statement 1 is incorrect. Biofilters primarily treat dissolved waste products, particularly nitrogenous compounds. Solid wastes, such as uneaten fish feed and feces, are typically removed by mechanical filters (like drum filters or settling tanks) *before* the water reaches the biofilter. While the decomposition of uneaten feed *produces* substances that the biofilter treats, the biofilter itself does not remove the solid feed. Statement 2 is correct. The main function of a biofilter in RAS is nitrification, which is the biological process where beneficial bacteria convert toxic ammonia (excreted by fish and from decomposition) first into nitrite and then into much less toxic nitrate. This is essential for maintaining water quality suitable for fish. Statement 3 is incorrect. Biofilters are designed to remove or convert waste products, not increase nutrients for fish. While phosphorus is present in fish feed and waste, biofilters are primarily focused on managing nitrogen. Systems for nutrient addition for fish involve providing high-quality feed, not manipulating waste products in the water circuit.","breadcrumb":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/with-reference-to-the-role-of-biofilters-in-recirculating-aquaculture\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/exam.pscnotes.com\/mcq\/with-reference-to-the-role-of-biofilters-in-recirculating-aquaculture\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/exam.pscnotes.com\/mcq\/with-reference-to-the-role-of-biofilters-in-recirculating-aquaculture\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/exam.pscnotes.com\/mcq\/"},{"@type":"ListItem","position":2,"name":"UPSC IAS","item":"https:\/\/exam.pscnotes.com\/mcq\/category\/upsc-ias\/"},{"@type":"ListItem","position":3,"name":"With reference to the role of biofilters in Recirculating Aquaculture"}]},{"@type":"WebSite","@id":"https:\/\/exam.pscnotes.com\/mcq\/#website","url":"https:\/\/exam.pscnotes.com\/mcq\/","name":"MCQ and Quiz for Exams","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/exam.pscnotes.com\/mcq\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209","name":"rawan239","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/761a7274f9cce048fa5b921221e7934820d74514df93ef195a9d22af0c1c9001?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/761a7274f9cce048fa5b921221e7934820d74514df93ef195a9d22af0c1c9001?s=96&d=mm&r=g","caption":"rawan239"},"sameAs":["https:\/\/exam.pscnotes.com"],"url":"https:\/\/exam.pscnotes.com\/mcq\/author\/rawan239\/"}]}},"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts\/92101","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/comments?post=92101"}],"version-history":[{"count":0,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts\/92101\/revisions"}],"wp:attachment":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/media?parent=92101"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/categories?post=92101"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/tags?post=92101"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}