{"id":57991,"date":"2022-01-25T16:35:51","date_gmt":"2022-01-25T11:05:51","guid":{"rendered":"https:\/\/infinitylearn.com\/surge\/?p=57991"},"modified":"2024-07-05T10:27:02","modified_gmt":"2024-07-05T04:57:02","slug":"ncert-exemplar-for-class-11-biology-chapter-18-body-fluids-and-circulation","status":"publish","type":"post","link":"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-exemplar-solutions\/class-11\/biology\/chapter-18-body-fluids-and-circulation\/","title":{"rendered":"NCERT Exemplar for Class 11 Biology Chapter 18 &#8211; Body Fluids and Circulation"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_37 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" style=\"display: none;\"><label for=\"item\" aria-label=\"Table of Content\"><span style=\"display: flex;align-items: center;width: 35px;height: 30px;justify-content: center;\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/label><input type=\"checkbox\" id=\"item\"><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' style='display:block'><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-exemplar-solutions\/class-11\/biology\/chapter-18-body-fluids-and-circulation\/#Introduction_of_Chapter\" title=\"Introduction of Chapter\">Introduction of Chapter<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-exemplar-solutions\/class-11\/biology\/chapter-18-body-fluids-and-circulation\/#The_chapter_Body_Fluids_and_Circulation_explores_into_the_connective_tissue_of_the_body_which_is_made_up_of_a_fluid_matrix_plasma_and_formed_elements_-_blood_Aside_from_blood_the_body_also_contains_lymph_which_is_a_type_of_tissue_fluid\" title=\"The chapter Body Fluids and Circulation explores into the connective tissue of the body, which is made up of a fluid matrix, plasma, and formed elements &#8211; blood. Aside from blood, the body also contains lymph, which is a type of tissue fluid.\">The chapter Body Fluids and Circulation explores into the connective tissue of the body, which is made up of a fluid matrix, plasma, and formed elements &#8211; blood. Aside from blood, the body also contains lymph, which is a type of tissue fluid.<\/a><ul class='ez-toc-list-level-3'><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-exemplar-solutions\/class-11\/biology\/chapter-18-body-fluids-and-circulation\/#Key_Features_of_NCERT_Exemplar_Solutions_for_Class_11_Biology_Chapter_18_-_Body_Fluids_and_Circulation\" title=\"Key Features of NCERT Exemplar Solutions for Class 11 Biology Chapter 18 \u2013 Body Fluids and Circulation\">Key Features of NCERT Exemplar Solutions for Class 11 Biology Chapter 18 \u2013 Body Fluids and Circulation<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-exemplar-solutions\/class-11\/biology\/chapter-18-body-fluids-and-circulation\/#Frequently_Asked_Questions_on_NCERT_Exemplar_Solutions_for_Class_11_Biology_Chapter_18\" title=\"Frequently Asked Questions on NCERT Exemplar Solutions for Class 11 Biology Chapter 18\">Frequently Asked Questions on NCERT Exemplar Solutions for Class 11 Biology Chapter 18<\/a><ul class='ez-toc-list-level-3'><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-exemplar-solutions\/class-11\/biology\/chapter-18-body-fluids-and-circulation\/#Q_What_concepts_can_I_learn_from_Chapter_18_of_NCERT_Exemplar_Solutions_for_Class_11_Biology\" title=\"Q. What concepts can I learn from Chapter 18 of NCERT Exemplar Solutions for Class 11 Biology?\">Q. What concepts can I learn from Chapter 18 of NCERT Exemplar Solutions for Class 11 Biology?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-exemplar-solutions\/class-11\/biology\/chapter-18-body-fluids-and-circulation\/#Q_Is_the_NCERT_Exemplar_Solutions_for_Class_11_Biology_Chapter_18_the_best_study_material_for_the_CBSE_students\" title=\"Q. Is the NCERT Exemplar Solutions for Class 11 Biology Chapter 18 the best study material for the CBSE students?\">Q. Is the NCERT Exemplar Solutions for Class 11 Biology Chapter 18 the best study material for the CBSE students?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-exemplar-solutions\/class-11\/biology\/chapter-18-body-fluids-and-circulation\/#Q_What_is_meant_by_double_circulation_and_explain_its_importance_from_Chapter_18_of_NCERT_Exemplar_Solutions_for_Class_11_Biology\" title=\"Q. What is meant by double circulation and explain its importance from Chapter 18 of NCERT Exemplar Solutions for Class 11 Biology?\">Q. What is meant by double circulation and explain its importance from Chapter 18 of NCERT Exemplar Solutions for Class 11 Biology?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<p><span style=\"font-size: 12pt;\"><span style=\"font-weight: 400;\">Subject specialists have created NCERT Exemplar Solutions for Class 11 Biology Chapter 18 Body Fluids and Circulation, <\/span><span style=\"font-weight: 400;\">which includes thorough solutions for reference. All of the unsolved questions from the textbook&#8217;s exercises are answered here. The NCERT Exemplar Solutions for Class 11 provide useful solutions for improving conceptual knowledge and help in entrance examinations like JEE mains and NEET.<\/span><\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 12pt;\">The solutions are carefully solved using student-friendly terms while still adhering to the norms that must be followed when solving NCERT Exemplar Solutions for Class 11. Practicing these answers can be incredibly advantageous not only in terms of exams but also in terms of helping Class 11 pupils perform well in upcoming competitive exams.<\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 12pt;\">The approaches for answering have been given special consideration to stay on target while not deviating from the intended answer. Because time is so important in exams, excellent time management when answering questions is essential for getting the best results.<\/span><\/p>\n<p><span style=\"font-size: 12pt;\">\n\t\t<div class=\"download-pdf-container\">\n\t\t\t<span class=\"title\">Do you need help with your Homework? 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wpcf7-validates-as-required wpcf7-validates-as-number\" aria-required=\"true\" aria-invalid=\"false\" \/><\/span><\/p>\n<p><span style=\"display:none;\"><span class=\"wpcf7-form-control-wrap current-page-url\"><input type=\"text\" name=\"current-page-url\" value=\"https:\/\/_:443\/surge\/wp-json\/wp\/v2\/posts\/57991\" size=\"40\" class=\"wpcf7-form-control wpcf7dtx-dynamictext wpcf7-dynamictext\" aria-invalid=\"false\" \/><\/span><\/span><\/p>\n<style>.wpcf7-list-item{margin: 0 0.5em 0 0!important;}<\/style>\n<p class=\"title\" style=\"color: #6e6e6e;font-size:14px;font-weight:400;text-decoration: un;\"><span class=\"wpcf7-form-control-wrap acceptance-agreement\"><span class=\"wpcf7-form-control wpcf7-acceptance\"><span class=\"wpcf7-list-item\"><input type=\"checkbox\" name=\"acceptance-agreement\" value=\"1\" aria-invalid=\"false\" checked=\"checked\" \/><\/span><\/span><\/span> I agree to the <a target=\"_blank\" href=\"https:\/\/infinitylearn.com\/terms\" style=\"text-decoration: underline;\">terms and conditions<\/a> and <a target=\"_blank\" href=\"https:\/\/infinitylearn.com\/privacy\" style=\"text-decoration: underline;\">privacy policy<\/a>.<\/p>\n<p><input type=\"button\" style=\"cursor:pointer;width:auto;\" class=\"il_otp_submit\" value=\"Get OTP\" onclick=\"sendCF7OTP(this, otp_phone.value, user_name.value)\"><\/p>\n<div class=\"form-submit-btn-div\" style=\"display:none;\">\n<input type=\"submit\" value=\"Download PDF\" class=\"wpcf7-form-control has-spinner wpcf7-submit download-pdf-submit\" \/>\n<\/div>\n<\/div>\n<div class=\"wpcf7-response-output\" aria-hidden=\"true\"><\/div><\/form><\/div>\n\t\t\t\t\t<span class=\"pdf-link hidden\" data-pdf=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/securepdfs\/2022\/01\/Class11_Biology_Chapter18DE-76.pdf\"><\/span>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t\t<div class=\"bg-overlay\"><\/div>\n\t\t<\/div>\n\t\t<a href=\"\/surge\/?pdfemb-serveurl=https%3A%2F%2Finfinitylearn.com%2Fsurge%2Fwp-content%2Fuploads%2Fsecurepdfs%2F2022%2F01%2FClass11_Biology_Chapter18DE-76.pdf\" class=\"pdfemb-viewer\" style=\"\" data-width=\"max\" data-height=\"max\" data-mobile-width=\"0\"  data-scrollbar=\"both\" data-download=\"off\" data-tracking=\"on\" data-newwindow=\"on\" data-pagetextbox=\"off\" data-scrolltotop=\"on\" data-startzoom=\"100\" data-startfpzoom=\"100\" data-download-nonce=\"9cd167fb5f\" data-disablerightclick=\"on\" data-toolbar=\"top\" data-toolbar-fixed=\"on\">Class11_Biology_Chapter18(DE-76)<br\/><\/a><\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 12pt;\">The NCERT Exemplar Solutions for Biology Class 11 Chapter 18 \u2013 Body Fluids and Circulation is part of Unit 5 \u2013 Human Physiology and is part of the CBSE Syllabus for the 2021-22 school year. Students can see the expected number from this unit by looking at past years&#8217; question papers. The unit is worth about 18 points out of a possible total of 25, or nearly a quarter of the question paper.<\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 12pt;\">The chapter Body Fluids and Circulation explains how complex fluids circulate in the body, as well as the many paths and modes of circulation. Students can expect to learn about the mechanism of heart activity as well as circulatory system problems.<\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 12pt;\">The types of questions that students expect in the second term CBSE board examination are listed below:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400; font-size: 12pt;\">Evaluation type<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400; font-size: 12pt;\">Remembering: knowledge-based<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400; font-size: 12pt;\">Understanding<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400; font-size: 12pt;\">Application type<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400; font-size: 12pt;\">Higher-order thinking skills \u2013 Analysing and Synthesis<\/span><\/li>\n<\/ul>\n<p><span style=\"font-size: 12pt;\"><b>The subtopics covered in Chapter 18 \u2013 Body Fluids and Circulation is listed below:<\/b><\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td><span style=\"font-size: 12pt;\"><b>Number<\/b><\/span><\/td>\n<td><span style=\"font-size: 12pt;\"><b>Subtopic<\/b><\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400; font-size: 12pt;\">18.1<\/span><\/td>\n<td><span style=\"font-weight: 400; font-size: 12pt;\">Blood<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400; font-size: 12pt;\">18.2<\/span><\/td>\n<td><span style=\"font-weight: 400; font-size: 12pt;\">Lymph (Tissue Fluid)<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400; font-size: 12pt;\">18.3<\/span><\/td>\n<td><span style=\"font-weight: 400; font-size: 12pt;\">Circulatory Pathways<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400; font-size: 12pt;\">18.4<\/span><\/td>\n<td><span style=\"font-weight: 400; font-size: 12pt;\">Double Circulation<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400; font-size: 12pt;\">18.5<\/span><\/td>\n<td><span style=\"font-weight: 400; font-size: 12pt;\">Regulation of Cardiac Activity<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400; font-size: 12pt;\">18.6<\/span><\/td>\n<td><span style=\"font-weight: 400; font-size: 12pt;\">Disorders of Circulatory System<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><span class=\"ez-toc-section\" id=\"Introduction_of_Chapter\"><\/span><span style=\"font-size: 12pt;\"><b>Introduction of Chapter<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h2><span class=\"ez-toc-section\" id=\"The_chapter_Body_Fluids_and_Circulation_explores_into_the_connective_tissue_of_the_body_which_is_made_up_of_a_fluid_matrix_plasma_and_formed_elements_-_blood_Aside_from_blood_the_body_also_contains_lymph_which_is_a_type_of_tissue_fluid\"><\/span><span style=\"font-weight: 400; font-size: 12pt;\">The chapter Body Fluids and Circulation explores into the connective tissue of the body, which is made up of a fluid matrix, plasma, and formed elements &#8211; blood. Aside from blood, the body also contains lymph, which is a type of tissue fluid.<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400; font-size: 12pt;\">A fluid matrix, plasma, and formed constituents make up blood, which is a particular connective tissue (erythrocytes, leukocytes and thrombocytes). Other subjects covered include diverse blood types, blood coagulation, and different circulatory paths.<\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 12pt;\">The heart is at the heart of the human circulatory system, and other key issues such as the cardiac cycle, electrocardiograph, double circulation, and other related topics are explored after that.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Key_Features_of_NCERT_Exemplar_Solutions_for_Class_11_Biology_Chapter_18_-_Body_Fluids_and_Circulation\"><\/span><span style=\"font-size: 12pt;\"><b>Key Features of NCERT Exemplar Solutions for Class 11 Biology Chapter 18 \u2013 Body Fluids and Circulation<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400; font-size: 12pt;\">The exact answer is a layout by solutions.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400; font-size: 12pt;\">In support of CBSE exam preparations, it is an extremely helpful tool.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400; font-size: 12pt;\">It is readily available.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400; font-size: 12pt;\">Downloading of solutions is free.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400; font-size: 12pt;\">The answers are simple and to the point.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400; font-size: 12pt;\">To learn rapidly and remember effectively use pointers.<\/span><\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Frequently_Asked_Questions_on_NCERT_Exemplar_Solutions_for_Class_11_Biology_Chapter_18\"><\/span><span style=\"font-size: 12pt;\"><b>Frequently Asked Questions on NCERT Exemplar Solutions for Class 11 Biology Chapter 18<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Q_What_concepts_can_I_learn_from_Chapter_18_of_NCERT_Exemplar_Solutions_for_Class_11_Biology\"><\/span><span style=\"font-weight: 400; font-size: 12pt; color: #0000ff;\">Q. What concepts can I learn from Chapter 18 of NCERT Exemplar Solutions for Class 11 Biology?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400; font-size: 12pt;\"><span style=\"color: #ff0000;\">Ans:<\/span> The concepts which are explained in Chapter 18 of NCERT Exemplar Solutions for Class 11 Biology are as follows:<\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 12pt;\">18.1 \u2013 Blood<\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 12pt;\">18.2 \u2013 Lymph (Tissue Fluid)<\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 12pt;\">18.3 \u2013 Circulatory Pathways<\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 12pt;\">18.4 \u2013 Double Circulation<\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 12pt;\">18.5 \u2013 Regulation of Cardiac Activity<\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 12pt;\">18.6 \u2013 Disorders of Circulatory System<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Q_Is_the_NCERT_Exemplar_Solutions_for_Class_11_Biology_Chapter_18_the_best_study_material_for_the_CBSE_students\"><\/span><span style=\"font-weight: 400; font-size: 12pt; color: #0000ff;\">Q. Is the NCERT Exemplar Solutions for Class 11 Biology Chapter 18 the best study material for the CBSE students?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400; font-size: 12pt;\"><span style=\"color: #ff0000;\">Ans:<\/span> Yes, our experts&#8217; NCERT Exemplar Solutions for Class 11 Biology Chapter 18 are the most effective study materials for CBSE students. To assist students do well on the term \u2013 II exam, each and every minute concept are briefly explained. The solutions not only aid students in their second-term exam preparation, but also in their confidence to take competitive exams such as JEE, NEET, and others. Our professionals provide solutions based on the CBSE board&#8217;s most recent term-by-term syllabus and material.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Q_What_is_meant_by_double_circulation_and_explain_its_importance_from_Chapter_18_of_NCERT_Exemplar_Solutions_for_Class_11_Biology\"><\/span><span style=\"font-weight: 400; font-size: 12pt; color: #0000ff;\">Q. What is meant by double circulation and explain its importance from Chapter 18 of NCERT Exemplar Solutions for Class 11 Biology?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400; font-size: 12pt;\"><span style=\"color: #ff0000;\">Ans:<\/span> The term &#8220;double circulation&#8221; refers to the fact that blood circulates twice in the heart. Double circulation is feasible because the heart is divided into four segments. This procedure aids in the detection and prevention of deoxygenated and oxygenated blood mixing. In this mechanism, oxygen is efficiently utilised. Students are encouraged to obtain the NCERT Exemplar Solutions from our website to better comprehend this idea. These solutions are tailored to the CBSE Syllabus and Guidelines for the second term in order to enable students master the term \u2013 II exam without anxiety.<\/span><\/p>\n<p><span style=\"font-size: 12pt; color: #0000ff;\">Q. Why Opt for Infinity Learn?<\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 12pt;\"><span style=\"color: #ff0000;\">Ans:<\/span> In this chapter Infinity Learn provides videos, notes, NCERT text book solutions, other practice book solutions and assignments that help you learn the concepts and to memorise the concepts for entrance exams and board exams. Most important, Infinity learn provide instant doubt support by subject experts.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Subject specialists have created NCERT Exemplar Solutions for Class 11 Biology Chapter 18 Body Fluids and Circulation, which includes thorough [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"","_yoast_wpseo_title":"NCERT Exemplar for Class 11 Biology Chapter 18","_yoast_wpseo_metadesc":"The NCERT exemplar Solutions Class 11 Biology Chapter 18 is available here. 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