{"id":5806,"date":"2025-12-30T18:17:35","date_gmt":"2025-12-30T18:17:35","guid":{"rendered":"https:\/\/mehnatt.com\/?p=5806"},"modified":"2025-12-30T18:17:36","modified_gmt":"2025-12-30T18:17:36","slug":"mcqs-based-on-environment-63","status":"publish","type":"post","link":"https:\/\/mehnatt.com\/?p=5806","title":{"rendered":"MCQs Based On Environment &#8211; (63)"},"content":{"rendered":"\n<h3 class=\"wp-block-heading\">Q1. Which of the following is an aggressive colonizer that poses a major threat to aquatic ecosystems in India?<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li style=\"font-size:17px\">Lantana camara<\/li>\n\n\n\n<li style=\"font-size:17px\">Water Hyacinth<\/li>\n\n\n\n<li style=\"font-size:17px\">Parthenium<\/li>\n\n\n\n<li style=\"font-size:17px\">Touch-me-not<\/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. Water Hyacinth <br\/>\n<strong>Explanation:<\/strong> Water Hyacinth (Eichhornia crassipes) is a floating aquatic plant native to Tropical America. It spreads rapidly in stagnant or slow-moving water, forming thick mats that:<br\/>\n\n&bull; Block sunlight for underwater plants<br\/>\n\n&bull; Deplete dissolved oxygen<br\/>\n\n&bull; Disrupt aquatic ecosystems<br\/>\n\n&bull; Hamper fishing, irrigation, and navigation<br\/>\n\n&bull; Hence, it is one of the most harmful invasive aquatic weeds in India and globally.\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. Which medicinal plant is the commercial source of Diosgenin used for synthesizing steroidal drugs?<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li style=\"font-size:17px\">Sarpagandha<\/li>\n\n\n\n<li style=\"font-size:17px\">Elephant\u2019s Foot<\/li>\n\n\n\n<li style=\"font-size:17px\">Kuth<\/li>\n\n\n\n<li style=\"font-size:17px\">Red Vanda<\/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. Elephant\u2019s Foot <br\/>\n<strong>Explanation:<\/strong> Elephant\u2019s Foot (Dioscorea species) is a wild yam found in the North-Western Himalayas. Its tubers are a commercial source of Diosgenin, a steroidal sapogenin.<br\/>\n\n&bull; Diosgenin is used in synthesizing cortisone, progesterone, pregnenolone, and other steroid-based pharmaceuticals.<br\/>\n\n&bull; Extracted via hydrolysis of saponins present in the tubers.<br\/>\n\nThis makes it highly valuable in pharmaceutical manufacturing.\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 part of the tree is responsible for transporting water and nutrients from the roots to the leaves?<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li style=\"font-size:17px\">Phloem<\/li>\n\n\n\n<li style=\"font-size:17px\">Cambium<\/li>\n\n\n\n<li style=\"font-size:17px\">Xylem<\/li>\n\n\n\n<li style=\"font-size:17px\">Heartwood<\/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. Xylem <br\/>\n<strong>Explanation:<\/strong> Xylem, also called sapwood, is the plant tissue that:<br\/>\n\n&bull; Transports water and minerals from the roots to stems and leaves.<br\/>\n\n&bull; Is made up of long, tubular vessels that enable upward conduction.<br\/>\n\n&bull; Its inner layers die over time to become heartwood, giving structural support.<br\/>\n\n&bull; Phloem transports food; cambium is a growth layer; heartwood is non-functional dead wood.\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. Which type of root allows parasitic plants to absorb nutrients from their host plants?<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li style=\"font-size:17px\">Taproots<\/li>\n\n\n\n<li style=\"font-size:17px\">Prop roots<\/li>\n\n\n\n<li style=\"font-size:17px\">Pneumatophores<\/li>\n\n\n\n<li style=\"font-size:17px\">Haustorial roots<\/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> 4. Haustorial roots <br\/>\n<strong>Explanation:<\/strong> Haustorial roots are specialized structures found in parasitic plants, such as:<br\/>\n\n&bull; Mistletoe (Viscum album)<br\/>\n\n&bull; Dodder (Cuscuta)<br\/>\n\nThese roots penetrate the host\u2019s tissues to absorb water and nutrients, allowing the parasite to survive without direct soil contact.<br\/>\n\nThey are vital for nutrient theft in obligate or partial parasitic plants.\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. What is the term for mass flowering of bamboo followed by death?<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li style=\"font-size:17px\">Etiolation<\/li>\n\n\n\n<li style=\"font-size:17px\">Tapering<\/li>\n\n\n\n<li style=\"font-size:17px\">Gregarious flowering<\/li>\n\n\n\n<li style=\"font-size:17px\">Autumn tinting<\/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. Gregarious flowering <br\/>\n<strong>Explanation:<\/strong> Gregarious flowering refers to the simultaneous flowering of a bamboo species across a wide area, followed by mass death of the plants.<br\/>\n\n&bull; Occurs after long intervals (e.g., 30\u2013120 years).<br\/>\n\n&bull; Results in massive seed production, often followed by ecological challenges like rodent population explosions and forest fires.<br\/>\n\nThis is an evolutionary survival strategy and causes serious forest management concerns.\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 an aggressive colonizer that poses a major threat to aquatic ecosystems in India? View Answer Correct Option: 2. Water Hyacinth Explanation: Water Hyacinth (Eichhornia crassipes) is a floating aquatic plant native to Tropical America. It spreads rapidly in stagnant or slow-moving water, forming thick mats that: &bull; Block sunlight [&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":[1244,222,21,1245,30,31,221,20,1246],"class_list":["post-5806","post","type-post","status-publish","format-standard","hentry","category-environment","tag-aggressive-colonizer","tag-bank-exams","tag-competitive-exams","tag-diosgenin","tag-environment","tag-mcq","tag-rrb-exams","tag-ssc-cgl","tag-steroidal-drugs"],"_links":{"self":[{"href":"https:\/\/mehnatt.com\/index.php?rest_route=\/wp\/v2\/posts\/5806","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=5806"}],"version-history":[{"count":3,"href":"https:\/\/mehnatt.com\/index.php?rest_route=\/wp\/v2\/posts\/5806\/revisions"}],"predecessor-version":[{"id":5809,"href":"https:\/\/mehnatt.com\/index.php?rest_route=\/wp\/v2\/posts\/5806\/revisions\/5809"}],"wp:attachment":[{"href":"https:\/\/mehnatt.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5806"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mehnatt.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5806"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mehnatt.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5806"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}