{"id":91077,"date":"2025-06-01T10:45:32","date_gmt":"2025-06-01T10:45:32","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=91077"},"modified":"2025-06-01T10:45:32","modified_gmt":"2025-06-01T10:45:32","slug":"consider-the-following-organisms-1-agaricus-2-nostoc-3-spirog","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/consider-the-following-organisms-1-agaricus-2-nostoc-3-spirog\/","title":{"rendered":"Consider the following organisms :\n  1. Agaricus  2. Nostoc  3. Spirog"},"content":{"rendered":"<p>Consider the following organisms :<\/p>\n<ul>\n<li>1. Agaricus<\/li>\n<li>2. Nostoc<\/li>\n<li>3. Spirogyra<\/li>\n<\/ul>\n<p>Which of the above is\/are used as biofertilizer\/biofertilizers?<\/p>\n<p>[amp_mcq option1=&#8221;1 and 2&#8243; option2=&#8221;2 only&#8221; option3=&#8221;2 and 3&#8243; option4=&#8221;3 only&#8221; correct=&#8221;option2&#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; 2013<\/div>\n<\/div>\n<div class=\"pyq-exam-psc-buttons\"><a href=\"\/pyq\/pyq-upsc-ias-2013.pdf\" target=\"_blank\" class=\"psc-pdf-button\" rel=\"noopener\">Download PDF<\/a><a href=\"\/pyq-upsc-ias-2013\" target=\"_blank\" class=\"psc-attempt-button\" rel=\"noopener\">Attempt Online<\/a><\/div>\n<\/div>\n<section id=\"pyq-correct-answer\">\nNostoc is used as a biofertilizer. Agaricus and Spirogyra are not typically used as biofertilizers.<br \/>\n<\/section>\n<section id=\"pyq-key-points\">\n1. Agaricus is a genus of fungi (mushrooms) and is not generally used as a biofertilizer. Some fungi like mycorrhizal fungi are used as biofertilizers as they enhance nutrient uptake, but Agaricus is not primarily used for this purpose.<br \/>\n2. Nostoc is a genus of cyanobacteria (blue-green algae) known for its ability to fix atmospheric nitrogen. It is widely used as a biofertilizer, especially in paddy fields.<br \/>\n3. Spirogyra is a genus of filamentous green algae. It is photosynthetic but does not fix nitrogen and is not used as a biofertilizer.<br \/>\n<\/section>\n<section id=\"pyq-additional-information\">\nBiofertilizers are substances containing live 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. Examples include nitrogen-fixing bacteria (Rhizobium, Azotobacter), cyanobacteria (Anabaena, Nostoc), and phosphorus-solubilizing microorganisms.<br \/>\n<\/section>\n","protected":false},"excerpt":{"rendered":"<p>Consider the following organisms : 1. Agaricus 2. Nostoc 3. Spirogyra Which of the above is\/are used as biofertilizer\/biofertilizers? [amp_mcq option1=&#8221;1 and 2&#8243; option2=&#8221;2 only&#8221; option3=&#8221;2 and 3&#8243; option4=&#8221;3 only&#8221; correct=&#8221;option2&#8243;] This question was previously asked in UPSC IAS &#8211; 2013 Download PDFAttempt Online Nostoc is used as a biofertilizer. Agaricus and Spirogyra are not &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Consider the following organisms :\n  1. Agaricus  2. Nostoc  3. Spirog\" class=\"read-more button\" href=\"https:\/\/exam.pscnotes.com\/mcq\/consider-the-following-organisms-1-agaricus-2-nostoc-3-spirog\/#more-91077\">Detailed Solution<span class=\"screen-reader-text\">Consider the following organisms :<br \/>\n  1. Agaricus  2. Nostoc  3. Spirog<\/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":[1467,1434,1117],"class_list":["post-91077","post","type-post","status-publish","format-standard","hentry","category-upsc-ias","tag-1467","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>Consider the following organisms :  1. Agaricus 2. Nostoc 3. 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Nostoc is a genus of cyanobacteria (blue-green algae) known for its ability to fix atmospheric nitrogen. It is widely used as a biofertilizer, especially in paddy fields. 3. Spirogyra is a genus of filamentous green algae. 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Agaricus is a genus of fungi (mushrooms) and is not generally used as a biofertilizer. Some fungi like mycorrhizal fungi are used as biofertilizers as they enhance nutrient uptake, but Agaricus is not primarily used for this purpose. 2. Nostoc is a genus of cyanobacteria (blue-green algae) known for its ability to fix atmospheric nitrogen. It is widely used as a biofertilizer, especially in paddy fields. 3. Spirogyra is a genus of filamentous green algae. It is photosynthetic but does not fix nitrogen and is not used as a biofertilizer.","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\/consider-the-following-organisms-1-agaricus-2-nostoc-3-spirog\/","og_locale":"en_US","og_type":"article","og_title":"Consider the following organisms :  1. Agaricus 2. Nostoc 3. Spirog","og_description":"Nostoc is used as a biofertilizer. Agaricus and Spirogyra are not typically used as biofertilizers. 1. Agaricus is a genus of fungi (mushrooms) and is not generally used as a biofertilizer. Some fungi like mycorrhizal fungi are used as biofertilizers as they enhance nutrient uptake, but Agaricus is not primarily used for this purpose. 2. Nostoc is a genus of cyanobacteria (blue-green algae) known for its ability to fix atmospheric nitrogen. It is widely used as a biofertilizer, especially in paddy fields. 3. Spirogyra is a genus of filamentous green algae. 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