{"id":5184,"date":"2025-11-21T15:45:11","date_gmt":"2025-11-21T15:45:11","guid":{"rendered":"https:\/\/mehnatt.com\/?p=5184"},"modified":"2025-11-21T15:45:11","modified_gmt":"2025-11-21T15:45:11","slug":"mcqs-based-on-environment-12","status":"publish","type":"post","link":"https:\/\/mehnatt.com\/?p=5184","title":{"rendered":"MCQs Based On Environment &#8211; (12)"},"content":{"rendered":"\n<h3 class=\"wp-block-heading\">Q1. Which of the following is the primary cause of cultural (manmade) eutrophication?<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li style=\"font-size:17px\">Volcanic eruptions<\/li>\n\n\n\n<li style=\"font-size:17px\">Fertilizer runoff from agricultural fields<\/li>\n\n\n\n<li style=\"font-size:17px\">Earthquake activity<\/li>\n\n\n\n<li style=\"font-size:17px\">Ocean currents<\/li>\n<\/ol>\n\n\n\n<button class=\"acc\">View Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"padding-top:5px;color:#27302a;font-size:1.2rem;\"><b>Correct Option:<\/b> 2. Fertilizer runoff from agricultural fields <br\/>\n<strong>Explanation:<\/strong> Cultural eutrophication is caused by excess nutrients, especially nitrogen and phosphorus, entering water bodies due to human activities, primarily from fertilizer runoff, untreated sewage, and waste. These nutrients promote algal growth, leading to oxygen depletion.\n\n<\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Q2. What is the main consequence of bacterial decomposition during eutrophication?<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li style=\"font-size:17px\">Increase in sunlight penetration<\/li>\n\n\n\n<li style=\"font-size:17px\">Increase in fish population<\/li>\n\n\n\n<li style=\"font-size:17px\">Depletion of dissolved oxygen<\/li>\n\n\n\n<li style=\"font-size:17px\">Reduction in algal bloom<\/li>\n<\/ol>\n\n\n\n<button class=\"acc\">View Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"padding-top:5px;color:#27302a;font-size:1.2rem;\"><b>Correct Option:<\/b> 3. Depletion of dissolved oxygen <br\/>\n<strong>Explanation:<\/strong> When algae die, bacteria decompose them, a process that consumes large amounts of oxygen. This leads to anoxic (oxygen-depleted) conditions, which can kill fish and other aquatic organisms.\n\n<\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Q3. Which term best describes the condition where oxygen is completely absent in a water body?<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li style=\"font-size:17px\">Aerobic<\/li>\n\n\n\n<li style=\"font-size:17px\">Anoxia<\/li>\n\n\n\n<li style=\"font-size:17px\">Hypoxia<\/li>\n\n\n\n<li style=\"font-size:17px\">Osmosis<\/li>\n<\/ol>\n\n\n\n<button class=\"acc\">View Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"padding-top:5px;color:#27302a;font-size:1.2rem;\"><b>Correct Option:<\/b> 2. Anoxia <br\/>\n<strong>Explanation:<\/strong> Anoxia is the absence of oxygen, while hypoxia is low oxygen levels. Anoxic conditions often result from eutrophication and cause the death of most aquatic life.\n\n<\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Q4. What is a Harmful Algal Bloom (HAB)?<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li style=\"font-size:17px\">A growth of algae producing toxins harmful to aquatic life and humans<\/li>\n\n\n\n<li style=\"font-size:17px\">A freshwater fish breeding season<\/li>\n\n\n\n<li style=\"font-size:17px\">A natural aquatic plant bloom<\/li>\n\n\n\n<li style=\"font-size:17px\">A sudden growth of marine mammals<\/li>\n<\/ol>\n\n\n\n<button class=\"acc\">View Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"padding-top:5px;color:#27302a;font-size:1.2rem;\"><b>Correct Option:<\/b> 1. A growth of algae producing toxins harmful to aquatic life and humans <br\/>\n<strong>Explanation:<\/strong> HABs are caused by algae that produce toxins which can harm marine life, birds, and humans. They are often fueled by nutrient enrichment and warm water.\n\n<\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Q5. Why is the term \u201cRed Tide\u201d considered a misnomer?<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li style=\"font-size:17px\">It always occurs at night<\/li>\n\n\n\n<li style=\"font-size:17px\">It only happens in freshwater<\/li>\n\n\n\n<li style=\"font-size:17px\">Not all algal blooms are red, nor caused by tides, and not always toxic<\/li>\n\n\n\n<li style=\"font-size:17px\">It has no impact on ecosystems<\/li>\n<\/ol>\n\n\n\n<button class=\"acc\">View Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"padding-top:5px;color:#27302a;font-size:1.2rem;\"><b>Correct Option:<\/b> 3. Not all algal blooms are red, nor caused by tides, and not always toxic <br\/>\n<strong>Explanation:<\/strong> The term \u201cRed Tide\u201d is misleading. Algal blooms can be green, brown, or red, are not related to tides, and may not always be harmful. The scientific term is Harmful Algal Blooms (HABs).\n\n<\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n","protected":false},"excerpt":{"rendered":"<p>Q1. Which of the following is the primary cause of cultural (manmade) eutrophication? View Answer Correct Option: 2. Fertilizer runoff from agricultural fields Explanation: Cultural eutrophication is caused by excess nutrients, especially nitrogen and phosphorus, entering water bodies due to human activities, primarily from fertilizer runoff, untreated sewage, and waste. These nutrients promote algal growth, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[19],"tags":[60,16,21,59,31,62,15,20],"class_list":["post-5184","post","type-post","status-publish","format-standard","hentry","category-environment","tag-algal-bloom","tag-bank","tag-competitive-exams","tag-eutrophication","tag-mcq","tag-red-tide","tag-rrb","tag-ssc-cgl"],"_links":{"self":[{"href":"https:\/\/mehnatt.com\/index.php?rest_route=\/wp\/v2\/posts\/5184","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mehnatt.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mehnatt.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mehnatt.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mehnatt.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=5184"}],"version-history":[{"count":7,"href":"https:\/\/mehnatt.com\/index.php?rest_route=\/wp\/v2\/posts\/5184\/revisions"}],"predecessor-version":[{"id":5191,"href":"https:\/\/mehnatt.com\/index.php?rest_route=\/wp\/v2\/posts\/5184\/revisions\/5191"}],"wp:attachment":[{"href":"https:\/\/mehnatt.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5184"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mehnatt.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5184"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mehnatt.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5184"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}