{"id":91860,"date":"2025-06-01T11:07:59","date_gmt":"2025-06-01T11:07:59","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=91860"},"modified":"2025-06-01T11:07:59","modified_gmt":"2025-06-01T11:07:59","slug":"consider-the-following-kinds-of-organisms-1-copepods-2-cyanobac","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/consider-the-following-kinds-of-organisms-1-copepods-2-cyanobac\/","title":{"rendered":"Consider the following kinds of organisms :\n  1. Copepods  2. Cyanobac"},"content":{"rendered":"<p>Consider the following kinds of organisms :<\/p>\n<ul>\n<li>1. Copepods<\/li>\n<li>2. Cyanobacteria<\/li>\n<li>3. Diatoms<\/li>\n<li>4. Foraminifera<\/li>\n<\/ul>\n<p>Which of the above are primary producers in the food chains of oceans?<\/p>\n<p>[amp_mcq option1=&#8221;1 and 2&#8243; option2=&#8221;2 and 3&#8243; option3=&#8221;3 and 4&#8243; option4=&#8221;1 and 4&#8243; 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; 2021<\/div>\n<\/div>\n<div class=\"pyq-exam-psc-buttons\"><a href=\"\/pyq\/pyq-upsc-ias-2021.pdf\" target=\"_blank\" class=\"psc-pdf-button\" rel=\"noopener\">Download PDF<\/a><a href=\"\/pyq-upsc-ias-2021\" target=\"_blank\" class=\"psc-attempt-button\" rel=\"noopener\">Attempt Online<\/a><\/div>\n<\/div>\n<section id=\"pyq-correct-answer\">\nPrimary producers in any ecosystem are organisms that produce organic compounds from inorganic carbon sources, usually through photosynthesis. In the oceans, the primary producers are mainly phytoplankton, which are microscopic photosynthetic organisms.<br \/>\n1. Copepods: These are small crustaceans belonging to zooplankton. They are consumers, typically feeding on phytoplankton or other smaller zooplankton.<br \/>\n2. Cyanobacteria: Also known as blue-green algae, these are photosynthetic bacteria. They are significant primary producers in both freshwater and marine environments, contributing substantially to global oxygen production.<br \/>\n3. Diatoms: These are a major group of algae and are among the most common types of phytoplankton. They are responsible for a large percentage of the world&#8217;s oxygen production and are a primary food source in marine food chains.<br \/>\n4. Foraminifera: These are single-celled protists with shells. While some species host symbiotic algae (which are primary producers), Foraminifera themselves are heterotrophic, meaning they consume other organisms (like bacteria or algae) or detritus. They are consumers, not primary producers.<br \/>\nTherefore, Cyanobacteria and Diatoms are primary producers in ocean food chains.<br \/>\n<\/section>\n<section id=\"pyq-key-points\">\nPrimary producers in the ocean are photosynthetic organisms, primarily phytoplankton like cyanobacteria and diatoms, which form the base of the marine food web.<br \/>\n<\/section>\n<section id=\"pyq-additional-information\">\nOther important groups of marine primary producers include dinoflagellates, coccolithophores, green algae, and larger seaweeds (macroalgae) in coastal areas.<br \/>\n<\/section>\n","protected":false},"excerpt":{"rendered":"<p>Consider the following kinds of organisms : 1. Copepods 2. Cyanobacteria 3. Diatoms 4. Foraminifera Which of the above are primary producers in the food chains of oceans? [amp_mcq option1=&#8221;1 and 2&#8243; option2=&#8221;2 and 3&#8243; option3=&#8221;3 and 4&#8243; option4=&#8221;1 and 4&#8243; correct=&#8221;option2&#8243;] This question was previously asked in UPSC IAS &#8211; 2021 Download PDFAttempt Online &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Consider the following kinds of organisms :\n  1. Copepods  2. Cyanobac\" class=\"read-more button\" href=\"https:\/\/exam.pscnotes.com\/mcq\/consider-the-following-kinds-of-organisms-1-copepods-2-cyanobac\/#more-91860\">Detailed Solution<span class=\"screen-reader-text\">Consider the following kinds of organisms :<br \/>\n  1. Copepods  2. Cyanobac<\/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":[1110,1117,1115],"class_list":["post-91860","post","type-post","status-publish","format-standard","hentry","category-upsc-ias","tag-1110","tag-biology","tag-miscellaneous","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 kinds of organisms :  1. Copepods 2. Cyanobac<\/title>\n<meta name=\"description\" content=\"Primary producers in any ecosystem are organisms that produce organic compounds from inorganic carbon sources, usually through photosynthesis. In the oceans, the primary producers are mainly phytoplankton, which are microscopic photosynthetic organisms. 1. Copepods: These are small crustaceans belonging to zooplankton. They are consumers, typically feeding on phytoplankton or other smaller zooplankton. 2. Cyanobacteria: Also known as blue-green algae, these are photosynthetic bacteria. They are significant primary producers in both freshwater and marine environments, contributing substantially to global oxygen production. 3. Diatoms: These are a major group of algae and are among the most common types of phytoplankton. They are responsible for a large percentage of the world&#039;s oxygen production and are a primary food source in marine food chains. 4. Foraminifera: These are single-celled protists with shells. While some species host symbiotic algae (which are primary producers), Foraminifera themselves are heterotrophic, meaning they consume other organisms (like bacteria or algae) or detritus. They are consumers, not primary producers. Therefore, Cyanobacteria and Diatoms are primary producers in ocean food chains. Primary producers in the ocean are photosynthetic organisms, primarily phytoplankton like cyanobacteria and diatoms, which form the base of the marine food web.\" \/>\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\/consider-the-following-kinds-of-organisms-1-copepods-2-cyanobac\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Consider the following kinds of organisms :  1. Copepods 2. Cyanobac\" \/>\n<meta property=\"og:description\" content=\"Primary producers in any ecosystem are organisms that produce organic compounds from inorganic carbon sources, usually through photosynthesis. In the oceans, the primary producers are mainly phytoplankton, which are microscopic photosynthetic organisms. 1. Copepods: These are small crustaceans belonging to zooplankton. They are consumers, typically feeding on phytoplankton or other smaller zooplankton. 2. Cyanobacteria: Also known as blue-green algae, these are photosynthetic bacteria. They are significant primary producers in both freshwater and marine environments, contributing substantially to global oxygen production. 3. Diatoms: These are a major group of algae and are among the most common types of phytoplankton. They are responsible for a large percentage of the world&#039;s oxygen production and are a primary food source in marine food chains. 4. Foraminifera: These are single-celled protists with shells. While some species host symbiotic algae (which are primary producers), Foraminifera themselves are heterotrophic, meaning they consume other organisms (like bacteria or algae) or detritus. They are consumers, not primary producers. Therefore, Cyanobacteria and Diatoms are primary producers in ocean food chains. Primary producers in the ocean are photosynthetic organisms, primarily phytoplankton like cyanobacteria and diatoms, which form the base of the marine food web.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/consider-the-following-kinds-of-organisms-1-copepods-2-cyanobac\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T11:07:59+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":"Consider the following kinds of organisms :  1. Copepods 2. Cyanobac","description":"Primary producers in any ecosystem are organisms that produce organic compounds from inorganic carbon sources, usually through photosynthesis. In the oceans, the primary producers are mainly phytoplankton, which are microscopic photosynthetic organisms. 1. Copepods: These are small crustaceans belonging to zooplankton. They are consumers, typically feeding on phytoplankton or other smaller zooplankton. 2. Cyanobacteria: Also known as blue-green algae, these are photosynthetic bacteria. They are significant primary producers in both freshwater and marine environments, contributing substantially to global oxygen production. 3. Diatoms: These are a major group of algae and are among the most common types of phytoplankton. They are responsible for a large percentage of the world's oxygen production and are a primary food source in marine food chains. 4. Foraminifera: These are single-celled protists with shells. While some species host symbiotic algae (which are primary producers), Foraminifera themselves are heterotrophic, meaning they consume other organisms (like bacteria or algae) or detritus. They are consumers, not primary producers. Therefore, Cyanobacteria and Diatoms are primary producers in ocean food chains. Primary producers in the ocean are photosynthetic organisms, primarily phytoplankton like cyanobacteria and diatoms, which form the base of the marine food web.","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-kinds-of-organisms-1-copepods-2-cyanobac\/","og_locale":"en_US","og_type":"article","og_title":"Consider the following kinds of organisms :  1. Copepods 2. Cyanobac","og_description":"Primary producers in any ecosystem are organisms that produce organic compounds from inorganic carbon sources, usually through photosynthesis. In the oceans, the primary producers are mainly phytoplankton, which are microscopic photosynthetic organisms. 1. Copepods: These are small crustaceans belonging to zooplankton. They are consumers, typically feeding on phytoplankton or other smaller zooplankton. 2. Cyanobacteria: Also known as blue-green algae, these are photosynthetic bacteria. They are significant primary producers in both freshwater and marine environments, contributing substantially to global oxygen production. 3. Diatoms: These are a major group of algae and are among the most common types of phytoplankton. They are responsible for a large percentage of the world's oxygen production and are a primary food source in marine food chains. 4. Foraminifera: These are single-celled protists with shells. While some species host symbiotic algae (which are primary producers), Foraminifera themselves are heterotrophic, meaning they consume other organisms (like bacteria or algae) or detritus. They are consumers, not primary producers. Therefore, Cyanobacteria and Diatoms are primary producers in ocean food chains. Primary producers in the ocean are photosynthetic organisms, primarily phytoplankton like cyanobacteria and diatoms, which form the base of the marine food web.","og_url":"https:\/\/exam.pscnotes.com\/mcq\/consider-the-following-kinds-of-organisms-1-copepods-2-cyanobac\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T11:07:59+00:00","author":"rawan239","twitter_card":"summary_large_image","twitter_misc":{"Written by":"rawan239","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/exam.pscnotes.com\/mcq\/consider-the-following-kinds-of-organisms-1-copepods-2-cyanobac\/","url":"https:\/\/exam.pscnotes.com\/mcq\/consider-the-following-kinds-of-organisms-1-copepods-2-cyanobac\/","name":"Consider the following kinds of organisms : 1. Copepods 2. Cyanobac","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T11:07:59+00:00","dateModified":"2025-06-01T11:07:59+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"Primary producers in any ecosystem are organisms that produce organic compounds from inorganic carbon sources, usually through photosynthesis. In the oceans, the primary producers are mainly phytoplankton, which are microscopic photosynthetic organisms. 1. Copepods: These are small crustaceans belonging to zooplankton. They are consumers, typically feeding on phytoplankton or other smaller zooplankton. 2. Cyanobacteria: Also known as blue-green algae, these are photosynthetic bacteria. They are significant primary producers in both freshwater and marine environments, contributing substantially to global oxygen production. 3. Diatoms: These are a major group of algae and are among the most common types of phytoplankton. They are responsible for a large percentage of the world's oxygen production and are a primary food source in marine food chains. 4. Foraminifera: These are single-celled protists with shells. While some species host symbiotic algae (which are primary producers), Foraminifera themselves are heterotrophic, meaning they consume other organisms (like bacteria or algae) or detritus. They are consumers, not primary producers. Therefore, Cyanobacteria and Diatoms are primary producers in ocean food chains. Primary producers in the ocean are photosynthetic organisms, primarily phytoplankton like cyanobacteria and diatoms, which form the base of the marine food web.","breadcrumb":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/consider-the-following-kinds-of-organisms-1-copepods-2-cyanobac\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/exam.pscnotes.com\/mcq\/consider-the-following-kinds-of-organisms-1-copepods-2-cyanobac\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/exam.pscnotes.com\/mcq\/consider-the-following-kinds-of-organisms-1-copepods-2-cyanobac\/#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":"Consider the following kinds of organisms : 1. Copepods 2. 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