{"id":19132,"date":"2024-01-09T06:28:54","date_gmt":"2024-01-09T00:58:54","guid":{"rendered":"https:\/\/vajiramandravi.com\/current-affairs\/?p=19132"},"modified":"2025-04-05T15:29:16","modified_gmt":"2025-04-05T09:59:16","slug":"elasmobranch","status":"publish","type":"post","link":"https:\/\/vajiramandravi.com\/current-affairs\/elasmobranch\/","title":{"rendered":"What is Elasmobranch?"},"content":{"rendered":"<h2>About Elasmobranch<\/h2>\n<ul>\n<li>The term elasmobranch refers\u00a0to the sharks, rays, and skates.<\/li>\n<li>These animals have a skeleton made of cartilage, rather than bone.<\/li>\n<li>The other subclass of cartilaginous fish,\u00a0the Holocephali, consists of\u00a0Chimaeras \u2013 ratfish (Genus Chimaera) and\u00a0elephantfish (Genus Callorhynchus).<\/li>\n<li>The main differences between these two subclasses are the structure of their gills and how they grow in the embryo.\n<ul>\n<li>Holocephali has\u00a0four gill slits with a gill cover (an operculum), while Elasmobranchs have\u00a0five to seven external gill slits with no gill cover.<\/li>\n<\/ul>\n<\/li>\n<li>Characteristics of Elasmobranchs\n<ul>\n<li>Its\u00a0skeleton is made of cartilage rather than bone.<\/li>\n<li>They have five to seven gill openings on each side.<\/li>\n<li>Rigid dorsal fins (and spines if present)<\/li>\n<li>Spiracles to aid in breathing<\/li>\n<li>The upper jaw of elasmobranchs is not fused to their skull.<\/li>\n<li>Elasmobranchs\u00a0have several rows of teeth which are continually replaced.<\/li>\n<li>They\u00a0don&#8217;t have swim bladders, but instead their large livers are full of oil to provide buoyancy.<\/li>\n<li>They\u00a0reproduce sexually with internal fertilization and either bear live young or lay eggs.<\/li>\n<li>Elasmobranch skin is made of tiny, hard, tooth-like\u00a0placoid scales called denticles.<\/li>\n<li>These are renowned for their\u00a0highly tuned senses, which make them incredibly successful in their environment.<\/li>\n<\/ul>\n<\/li>\n<li>Their distribution ranges\u00a0from nearshore regions to the deep oceanic waters.<\/li>\n<li>Some species are known to travel long distances, hence can be considered\u00a0as highly migratory. Their stock can be found in more than one Exclusive Economic Zone (EEZ)<\/li>\n<li>They are\u00a0widely distributed in the Oceans but are most diverse in the\u00a0tropical and subtropical IndoPacific Ocean.<\/li>\n<\/ul>\n<hr \/>\n<h3>Q1) What is cartilage?<\/h3>\n<p>Cartilage is a strong, flexible connective tissue that protects your joints and bones. It acts as a shock absorber throughout your body. Cartilage at the end of your bones reduces friction and prevents them from rubbing together when you use your joints.<\/p>\n<p><strong>Source:<\/strong> <a href=\"https:\/\/www.downtoearth.org.in\/news\/wildlife-biodiversity\/shark-ray-meat-consumption-no-longer-restricted-to-india-s-tribal-coastal-peoples-paper-93760\" target=\"_blank\" rel=\"nofollow noopener\"><u>Shark &amp; ray meat consumption no longer restricted to India\u2019s tribal &amp; coastal peoples: Paper<\/u><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Elasmobranch animals have a skeleton made of cartilage, rather than bone.<\/p>\n","protected":false},"author":5,"featured_media":19133,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":{"0":"post-19132","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-upsc-prelims-current-affairs","8":"no-featured-image-padding"},"acf":[],"_links":{"self":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts\/19132","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/comments?post=19132"}],"version-history":[{"count":0,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts\/19132\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/media\/19133"}],"wp:attachment":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/media?parent=19132"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/categories?post=19132"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/tags?post=19132"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}