{"id":87043,"date":"2025-06-01T04:26:58","date_gmt":"2025-06-01T04:26:58","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=87043"},"modified":"2025-06-01T04:26:58","modified_gmt":"2025-06-01T04:26:58","slug":"duckweed-or-azolla-is-used-as-a-an","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/duckweed-or-azolla-is-used-as-a-an\/","title":{"rendered":"Duckweed or Azolla is used as a\/an"},"content":{"rendered":"

Duckweed or Azolla is used as a\/an<\/p>\n

[amp_mcq option1=”pesticide” option2=”biofertilizer” option3=”arsenic indicator” option4=”antiseptic” correct=”option2″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC Geoscientist – 2023<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nAzolla is a small aquatic fern that lives in symbiotic association with the nitrogen-fixing cyanobacterium Anabaena azollae. This symbiosis allows Azolla to fix atmospheric nitrogen into a usable form for plants, making it an excellent natural biofertilizer, particularly for rice paddies. Duckweed (Lemna, etc.) is also an aquatic plant that can be used as green manure, contributing organic matter and nutrients, broadly fitting the category of biofertilizer in this context, though Azolla’s nitrogen-fixing capability is more prominent.
\n<\/section>\n
\n– Azolla is a symbiotic host for nitrogen-fixing cyanobacteria (Anabaena azollae).
\n– Nitrogen fixation makes Azolla a valuable biofertilizer, especially in agriculture.
\n– Duckweed can also be used as a source of organic matter and nutrients.
\n<\/section>\n
\nBiofertilizers are substances containing living microorganisms which, when applied to seed, plant surfaces, or soil, colonize the rhizosphere or the interior of the plant and promote growth by increasing the supply or availability of primary nutrients to the host plant. Azolla has been used for centuries as a biofertilizer in wetland rice cultivation.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

Duckweed or Azolla is used as a\/an [amp_mcq option1=”pesticide” option2=”biofertilizer” option3=”arsenic indicator” option4=”antiseptic” correct=”option2″] This question was previously asked in UPSC Geoscientist – 2023 Download PDFAttempt Online Azolla is a small aquatic fern that lives in symbiotic association with the nitrogen-fixing cyanobacterium Anabaena azollae. This symbiosis allows Azolla to fix atmospheric nitrogen into a usable … <\/p>\n

Detailed SolutionDuckweed or Azolla is used as a\/an<\/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":[1091],"tags":[1105,1434,1117],"class_list":["post-87043","post","type-post","status-publish","format-standard","hentry","category-upsc-geoscientist","tag-1105","tag-biofertilizers","tag-biology","no-featured-image-padding"],"yoast_head":"\nDuckweed or Azolla is used as a\/an<\/title>\n<meta name=\"description\" content=\"Azolla is a small aquatic fern that lives in symbiotic association with the nitrogen-fixing cyanobacterium Anabaena azollae. This symbiosis allows Azolla to fix atmospheric nitrogen into a usable form for plants, making it an excellent natural biofertilizer, particularly for rice paddies. Duckweed (Lemna, etc.) is also an aquatic plant that can be used as green manure, contributing organic matter and nutrients, broadly fitting the category of biofertilizer in this context, though Azolla's nitrogen-fixing capability is more prominent. - Azolla is a symbiotic host for nitrogen-fixing cyanobacteria (Anabaena azollae). - Nitrogen fixation makes Azolla a valuable biofertilizer, especially in agriculture. - Duckweed can also be used as a source of organic matter and nutrients.\" \/>\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\/duckweed-or-azolla-is-used-as-a-an\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Duckweed or Azolla is used as a\/an\" \/>\n<meta property=\"og:description\" content=\"Azolla is a small aquatic fern that lives in symbiotic association with the nitrogen-fixing cyanobacterium Anabaena azollae. This symbiosis allows Azolla to fix atmospheric nitrogen into a usable form for plants, making it an excellent natural biofertilizer, particularly for rice paddies. Duckweed (Lemna, etc.) is also an aquatic plant that can be used as green manure, contributing organic matter and nutrients, broadly fitting the category of biofertilizer in this context, though Azolla's nitrogen-fixing capability is more prominent. - Azolla is a symbiotic host for nitrogen-fixing cyanobacteria (Anabaena azollae). - Nitrogen fixation makes Azolla a valuable biofertilizer, especially in agriculture. - Duckweed can also be used as a source of organic matter and nutrients.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/duckweed-or-azolla-is-used-as-a-an\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T04:26:58+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=\"1 minute\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Duckweed or Azolla is used as a\/an","description":"Azolla is a small aquatic fern that lives in symbiotic association with the nitrogen-fixing cyanobacterium Anabaena azollae. 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