{"id":89621,"date":"2025-06-01T10:09:16","date_gmt":"2025-06-01T10:09:16","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=89621"},"modified":"2025-06-01T10:09:16","modified_gmt":"2025-06-01T10:09:16","slug":"leaves-of-lotus-and-water-lily-are-not-easily-wet-because-the-leaves","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/leaves-of-lotus-and-water-lily-are-not-easily-wet-because-the-leaves\/","title":{"rendered":"Leaves of lotus and water lily are not easily wet because the leaves"},"content":{"rendered":"<p>Leaves of lotus and water lily are not easily wet because the leaves<\/p>\n<ul>\n<li>1. have surface uneven in micro-scale and water cannot come into contact with the depressed areas due to high surface tension<\/li>\n<li>2. contain an oily substance<\/li>\n<li>3. contain a greasy substance<\/li>\n<li>4. have surface too smooth to attract water<\/li>\n<\/ul>\n<p>Select the correct answer using the code given below.<\/p>\n<p>[amp_mcq option1=&#8221;1 and 3 only&#8221; option2=&#8221;3 and 4&#8243; option3=&#8221;1 and 2 only&#8221; option4=&#8221;1, 2 and 3&#8243; correct=&#8221;option4&#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 CAPF &#8211; 2013<\/div>\n<\/div>\n<div class=\"pyq-exam-psc-buttons\"><a href=\"\/pyq\/pyq-upsc-capf-2013.pdf\" target=\"_blank\" class=\"psc-pdf-button\" rel=\"noopener\">Download PDF<\/a><a href=\"\/pyq-upsc-capf-2013\" target=\"_blank\" class=\"psc-attempt-button\" rel=\"noopener\">Attempt Online<\/a><\/div>\n<\/div>\n<section id=\"pyq-correct-answer\">\nThe correct option is D. Leaves of lotus and water lily are not easily wet because of the combined effect described in statements 1, 2, and 3.<br \/>\n<\/section>\n<section id=\"pyq-key-points\">\nThe &#8216;lotus effect&#8217; refers to the superhydrophobicity and self-cleaning property of lotus leaves. This is primarily due to the hierarchical microscopic and nanoscopic structure on the leaf surface (statement 1) combined with the presence of hydrophobic substances like epicuticular waxes (statements 2 and 3). The surface structure creates a rough texture where water droplets sit on the tips of micro-papillae, trapping air beneath them (Cassie-Baxter state). This minimizes contact area between water and the leaf surface, amplified by the low surface energy provided by the waxes (oily\/greasy substances), resulting in high contact angles and low adhesion for water droplets. Statement 4 is incorrect as smoothness generally increases wetting.<br \/>\n<\/section>\n<section id=\"pyq-additional-information\">\nStatement 1 describes the crucial structural aspect and its physical consequence (water cannot fully contact depressed areas, leading to high surface tension effects like droplet formation). Statements 2 and 3 describe the chemical composition of the coating (waxes), which are hydrophobic (water-repelling) and are typically described as oily or greasy. Both the structure and the hydrophobic coating are essential for the lotus effect.<br \/>\n<\/section>\n","protected":false},"excerpt":{"rendered":"<p>Leaves of lotus and water lily are not easily wet because the leaves 1. have surface uneven in micro-scale and water cannot come into contact with the depressed areas due to high surface tension 2. contain an oily substance 3. contain a greasy substance 4. have surface too smooth to attract water Select the correct &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Leaves of lotus and water lily are not easily wet because the leaves\" class=\"read-more button\" href=\"https:\/\/exam.pscnotes.com\/mcq\/leaves-of-lotus-and-water-lily-are-not-easily-wet-because-the-leaves\/#more-89621\">Detailed Solution<span class=\"screen-reader-text\">Leaves of lotus and water lily are not easily wet because the leaves<\/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":[1085],"tags":[1467,1117,1118],"class_list":["post-89621","post","type-post","status-publish","format-standard","hentry","category-upsc-capf","tag-1467","tag-biology","tag-plant-physiology","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>Leaves of lotus and water lily are not easily wet because the leaves<\/title>\n<meta name=\"description\" content=\"The correct option is D. Leaves of lotus and water lily are not easily wet because of the combined effect described in statements 1, 2, and 3. The &#039;lotus effect&#039; refers to the superhydrophobicity and self-cleaning property of lotus leaves. This is primarily due to the hierarchical microscopic and nanoscopic structure on the leaf surface (statement 1) combined with the presence of hydrophobic substances like epicuticular waxes (statements 2 and 3). The surface structure creates a rough texture where water droplets sit on the tips of micro-papillae, trapping air beneath them (Cassie-Baxter state). This minimizes contact area between water and the leaf surface, amplified by the low surface energy provided by the waxes (oily\/greasy substances), resulting in high contact angles and low adhesion for water droplets. Statement 4 is incorrect as smoothness generally increases wetting.\" \/>\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\/leaves-of-lotus-and-water-lily-are-not-easily-wet-because-the-leaves\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Leaves of lotus and water lily are not easily wet because the leaves\" \/>\n<meta property=\"og:description\" content=\"The correct option is D. Leaves of lotus and water lily are not easily wet because of the combined effect described in statements 1, 2, and 3. The &#039;lotus effect&#039; refers to the superhydrophobicity and self-cleaning property of lotus leaves. This is primarily due to the hierarchical microscopic and nanoscopic structure on the leaf surface (statement 1) combined with the presence of hydrophobic substances like epicuticular waxes (statements 2 and 3). The surface structure creates a rough texture where water droplets sit on the tips of micro-papillae, trapping air beneath them (Cassie-Baxter state). This minimizes contact area between water and the leaf surface, amplified by the low surface energy provided by the waxes (oily\/greasy substances), resulting in high contact angles and low adhesion for water droplets. Statement 4 is incorrect as smoothness generally increases wetting.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/leaves-of-lotus-and-water-lily-are-not-easily-wet-because-the-leaves\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T10:09:16+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":"Leaves of lotus and water lily are not easily wet because the leaves","description":"The correct option is D. Leaves of lotus and water lily are not easily wet because of the combined effect described in statements 1, 2, and 3. The 'lotus effect' refers to the superhydrophobicity and self-cleaning property of lotus leaves. This is primarily due to the hierarchical microscopic and nanoscopic structure on the leaf surface (statement 1) combined with the presence of hydrophobic substances like epicuticular waxes (statements 2 and 3). The surface structure creates a rough texture where water droplets sit on the tips of micro-papillae, trapping air beneath them (Cassie-Baxter state). This minimizes contact area between water and the leaf surface, amplified by the low surface energy provided by the waxes (oily\/greasy substances), resulting in high contact angles and low adhesion for water droplets. Statement 4 is incorrect as smoothness generally increases wetting.","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\/leaves-of-lotus-and-water-lily-are-not-easily-wet-because-the-leaves\/","og_locale":"en_US","og_type":"article","og_title":"Leaves of lotus and water lily are not easily wet because the leaves","og_description":"The correct option is D. Leaves of lotus and water lily are not easily wet because of the combined effect described in statements 1, 2, and 3. The 'lotus effect' refers to the superhydrophobicity and self-cleaning property of lotus leaves. This is primarily due to the hierarchical microscopic and nanoscopic structure on the leaf surface (statement 1) combined with the presence of hydrophobic substances like epicuticular waxes (statements 2 and 3). The surface structure creates a rough texture where water droplets sit on the tips of micro-papillae, trapping air beneath them (Cassie-Baxter state). This minimizes contact area between water and the leaf surface, amplified by the low surface energy provided by the waxes (oily\/greasy substances), resulting in high contact angles and low adhesion for water droplets. Statement 4 is incorrect as smoothness generally increases wetting.","og_url":"https:\/\/exam.pscnotes.com\/mcq\/leaves-of-lotus-and-water-lily-are-not-easily-wet-because-the-leaves\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T10:09:16+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\/leaves-of-lotus-and-water-lily-are-not-easily-wet-because-the-leaves\/","url":"https:\/\/exam.pscnotes.com\/mcq\/leaves-of-lotus-and-water-lily-are-not-easily-wet-because-the-leaves\/","name":"Leaves of lotus and water lily are not easily wet because the leaves","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T10:09:16+00:00","dateModified":"2025-06-01T10:09:16+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"The correct option is D. Leaves of lotus and water lily are not easily wet because of the combined effect described in statements 1, 2, and 3. The 'lotus effect' refers to the superhydrophobicity and self-cleaning property of lotus leaves. This is primarily due to the hierarchical microscopic and nanoscopic structure on the leaf surface (statement 1) combined with the presence of hydrophobic substances like epicuticular waxes (statements 2 and 3). The surface structure creates a rough texture where water droplets sit on the tips of micro-papillae, trapping air beneath them (Cassie-Baxter state). This minimizes contact area between water and the leaf surface, amplified by the low surface energy provided by the waxes (oily\/greasy substances), resulting in high contact angles and low adhesion for water droplets. Statement 4 is incorrect as smoothness generally increases wetting.","breadcrumb":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/leaves-of-lotus-and-water-lily-are-not-easily-wet-because-the-leaves\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/exam.pscnotes.com\/mcq\/leaves-of-lotus-and-water-lily-are-not-easily-wet-because-the-leaves\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/exam.pscnotes.com\/mcq\/leaves-of-lotus-and-water-lily-are-not-easily-wet-because-the-leaves\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/exam.pscnotes.com\/mcq\/"},{"@type":"ListItem","position":2,"name":"UPSC CAPF","item":"https:\/\/exam.pscnotes.com\/mcq\/category\/upsc-capf\/"},{"@type":"ListItem","position":3,"name":"Leaves of lotus and water lily are not easily wet because the leaves"}]},{"@type":"WebSite","@id":"https:\/\/exam.pscnotes.com\/mcq\/#website","url":"https:\/\/exam.pscnotes.com\/mcq\/","name":"MCQ and Quiz for Exams","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/exam.pscnotes.com\/mcq\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209","name":"rawan239","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/761a7274f9cce048fa5b921221e7934820d74514df93ef195a9d22af0c1c9001?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/761a7274f9cce048fa5b921221e7934820d74514df93ef195a9d22af0c1c9001?s=96&d=mm&r=g","caption":"rawan239"},"sameAs":["https:\/\/exam.pscnotes.com"],"url":"https:\/\/exam.pscnotes.com\/mcq\/author\/rawan239\/"}]}},"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts\/89621","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/comments?post=89621"}],"version-history":[{"count":0,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts\/89621\/revisions"}],"wp:attachment":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/media?parent=89621"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/categories?post=89621"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/tags?post=89621"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}