{"id":27122,"date":"2019-09-14T11:29:15","date_gmt":"2019-09-14T05:59:15","guid":{"rendered":"http:\/\/mycbseguide.com\/blog\/?p=27122"},"modified":"2019-09-16T10:36:26","modified_gmt":"2019-09-16T05:06:26","slug":"class-12-biology-organisms-and-populations-important-questions","status":"publish","type":"post","link":"https:\/\/mycbseguide.com\/blog\/class-12-biology-organisms-and-populations-important-questions\/","title":{"rendered":"Class 12 Biology Organisms and Populations Important Questions"},"content":{"rendered":"<p><strong>Class 12 Biology Organisms and Populations Important Questions. <\/strong>myCBSEguide has just released Chapter Wise Question Answers for class 12 Biology. There chapter wise Test papers with complete solutions are available for download in <strong><a href=\"https:\/\/mycbseguide.com\/\">myCBSEguide<\/a>\u00a0<\/strong>website and mobile app. These Extra Questions with solution are prepared by our team of expert teachers who are teaching grade in CBSE schools for years. There are around 4-5 set of solved Biology Extra questions from each and every chapter. The students will not miss any concept in these Chapter wise question that are specially designed to tackle Board Exam. We have taken care of every single concept given in\u00a0<a href=\"https:\/\/mycbseguide.com\/course\/cbse-class-12-biology\/1298\/\"><strong>CBSE Class 12 Biology<\/strong>\u00a0<strong>syllabus<\/strong><\/a>\u00a0and questions are framed as per the latest marking scheme and blue print issued by CBSE for Class 12.<\/p>\n<p style=\"text-align: center;\"><strong>CBSE Class 12 Biology Ch \u2013 13 Important Questions<\/strong><\/p>\n<p style=\"text-align: center;\"><strong><a class=\"button\" href=\"https:\/\/mycbseguide.com\/dashboard\/category\/1311\/type\/4\">Download as PDF<\/a><\/strong><\/p>\n<h2>Chapter 13 Test Papers Class 12 Biology<\/h2>\n<div class=\"justify-content-center d-flex\" style=\"text-align: center;\">\n<p><strong>Ch-13 Organisms and Populations<\/strong><\/p>\n<hr \/>\n<\/div>\n<ol>\n<li class=\"question-list\">Which of the following will not be considered a predator?\n<ol start=\"1\">\n<li class=\"question-list\"><span class=\"mcq_option_text\">Vultures<\/span><\/li>\n<li class=\"question-list\">Paramecium<\/li>\n<li class=\"question-list\">starfish<\/li>\n<li class=\"question-list\">Tiger<\/li>\n<\/ol>\n<\/li>\n<li class=\"question-list\">At high altitudes our body compensates for deficiency of oxygen by\n<ol start=\"1\">\n<li class=\"question-list\">\n<div class=\"question-marks\"><span class=\"mcq_option_text\">Decreasing rate of breathing<\/span><\/div>\n<\/li>\n<li class=\"question-list\">\n<div class=\"question-marks\"><span class=\"mcq_option_text\">Reducing the rate of respiration within cells<\/span><\/div>\n<\/li>\n<li class=\"question-list\">\n<div class=\"question-marks\"><span class=\"mcq_option_text\">Increasing white blood cell production<\/span><\/div>\n<\/li>\n<li class=\"question-list\">\n<div class=\"question-marks\"><span class=\"mcq_option_text\">Reducing affinity of Hb for oxygen binding<\/span><\/div>\n<\/li>\n<\/ol>\n<\/li>\n<li class=\"question-list\">\n<div class=\"question-marks\">Shrew, rat and rabbit living together in a grassland exhibit:<\/div>\n<ol start=\"1\">\n<li class=\"question-list\">\n<div class=\"question-marks\"><span class=\"mcq_option_text\">amensalism<\/span><\/div>\n<\/li>\n<li class=\"question-list\">\n<div class=\"question-marks\"><span class=\"mcq_option_text\">commensalism<\/span><\/div>\n<\/li>\n<li class=\"question-list\">\n<div class=\"question-marks\"><span class=\"mcq_option_text\">mutualism<\/span><\/div>\n<\/li>\n<li class=\"question-list\">\n<div class=\"question-marks\"><span class=\"mcq_option_text\">neutralism<\/span><\/div>\n<\/li>\n<\/ol>\n<\/li>\n<li class=\"question-list\">\n<div class=\"question-marks\">Organisms having the potential for interbreeding and producing fertile offspring is called<\/div>\n<ol start=\"1\">\n<li class=\"question-list\">\n<div class=\"question-marks\"><span class=\"mcq_option_text\">Class<\/span><\/div>\n<\/li>\n<li class=\"question-list\">\n<div class=\"question-marks\"><span class=\"mcq_option_text\">Genus<\/span><\/div>\n<\/li>\n<li class=\"question-list\">\n<div class=\"question-marks\"><span class=\"mcq_option_text\">Order<\/span><\/div>\n<\/li>\n<li class=\"question-list\">\n<div class=\"question-marks\"><span class=\"mcq_option_text\">Species<\/span><\/div>\n<\/li>\n<\/ol>\n<\/li>\n<li class=\"question-list\">\n<div class=\"question-marks\">The statistical study of human population is called<\/div>\n<ol start=\"1\">\n<li class=\"question-list\">\n<div class=\"question-marks\"><span class=\"mcq_option_text\">Population human genetics<\/span><\/div>\n<\/li>\n<li class=\"question-list\">\n<div class=\"question-marks\"><span class=\"mcq_option_text\">Sociology<\/span><\/div>\n<\/li>\n<li class=\"question-list\">\n<div class=\"question-marks\"><span class=\"mcq_option_text\">Demography<\/span><\/div>\n<\/li>\n<li class=\"question-list\">\n<div class=\"question-marks\"><span class=\"mcq_option_text\">Biostatistics<\/span><\/div>\n<\/li>\n<\/ol>\n<\/li>\n<li class=\"question-list\">Which one out of the eurythermal or stenothermal species, is likely to survive increased global temperature? (give reason)<\/li>\n<li class=\"question-list\">\n<div class=\"question-container\">\n<div class=\"question-text\">\n<p>How do animals like fish and snails avoid summer related unfavourable conditions?<\/p>\n<\/div>\n<\/div>\n<\/li>\n<li class=\"question-list\">\n<div class=\"question-container\">\n<div class=\"question-text\">\n<p>Why are herbivores considered similar to predators in the iconological context? Explain.<\/p>\n<\/div>\n<\/div>\n<\/li>\n<li class=\"question-list\">\n<div class=\"question-container\">\n<div class=\"question-text\">\n<p>Why do cattle avoid browsing on Calotropis plants? Explain.<\/p>\n<\/div>\n<\/div>\n<\/li>\n<li class=\"question-list\">\n<div class=\"question-container\">\n<div class=\"question-text\">\n<p>What does S-shaped pattern of population growth represent? How is T-shaped pattern different from it and why?<\/p>\n<\/div>\n<\/div>\n<\/li>\n<li class=\"question-list\">\n<div class=\"question-container\">\n<div class=\"question-text\">\n<p>Define population and community.<\/p>\n<\/div>\n<\/div>\n<\/li>\n<li class=\"question-list\">\n<div class=\"question-container\">\n<div class=\"question-text\">\n<p>Egrets are often seen along with grazing cattle. How do you refer to this interaction? Give reason.<\/p>\n<\/div>\n<\/div>\n<\/li>\n<li class=\"question-list\">\n<div class=\"question-container\">\n<div class=\"question-text\">\n<p>Define phenotypic adaptation. Give one example.<\/p>\n<\/div>\n<\/div>\n<\/li>\n<li class=\"question-list\">\n<div class=\"question-container\">\n<div class=\"question-text\">\n<p>Why is thermoregulation more effectively achieved in larger animals than in smaller ones?<\/p>\n<\/div>\n<\/div>\n<\/li>\n<li class=\"question-list\">\n<div class=\"question-container\">\n<div class=\"question-text\">\n<p>Write a short note on: Effect of temperature or water scarcity and the adaptations of animals.<\/p>\n<\/div>\n<\/div>\n<\/li>\n<\/ol>\n<p style=\"text-align: center;\"><strong>Ch-13 Organisms and Populations<\/strong><\/p>\n<hr \/>\n<p><strong>Answer<\/strong><\/p>\n<ol>\n<li class=\"question-list\">\n<ol type=\"a\">\n<li>Vultures,\u00a0<strong>Explanation:\u00a0<\/strong>Vultures will not be considered as predator. Vultures feed on dead animals on the other hand predators kill or harms the prey for obtaining food.<\/li>\n<\/ol>\n<\/li>\n<li class=\"question-list\">\n<ol start=\"4\" type=\"a\">\n<li>Reducing affinity of Hb for oxygen binding,\u00a0<strong>Explanation:\u00a0<\/strong>At higher altitudes concentration of oxygen decreases in air due to decreae in air pressure. Our body compensate the deficiency of oxygen at higher altitude by reducing affinity of hemoglobin (Hb) for oxygen binding.<\/li>\n<\/ol>\n<\/li>\n<li class=\"question-list\">\n<ol start=\"4\" type=\"a\">\n<li>neutralism,\u00a0<strong>Explanation:\u00a0<\/strong>Neutralism is a kind of relationship in which different organisms live in same habitat but do not harm each other. Shrew, rat and rabbit lives in same grassland but do not compete for food and shelter.<\/li>\n<\/ol>\n<\/li>\n<li class=\"question-list\">\n<ol start=\"4\" type=\"a\">\n<li>Species,\u00a0<strong>Explanation:\u00a0<\/strong>A species is a group of individual organisms that interbreed and produce fertile, viable offspring. According to this definition, one species is distinguished from another when, in nature, it is not possible for matings between individuals from each species to produce fertile offspring.<\/li>\n<\/ol>\n<\/li>\n<li class=\"question-list\">\n<ol start=\"3\" type=\"a\">\n<li>Demography,\u00a0<strong>Explanation:\u00a0<\/strong>The statistical study of human population in a particular area that changes over time or space is called demography. It includes size, growth, density, distribution and vital statistics.<\/li>\n<\/ol>\n<\/li>\n<li class=\"question-list\">Eurythermal species: They can tolerate and thrive in a wide range of temperatures.<\/li>\n<li class=\"question-list\">Snails and fish go into aestivation to avoid summer-related unfavourable conditions by suspending their metabolic activities.<\/li>\n<li class=\"question-list\">Herbivores are considered similar to predators in iconological context because they transfer the energy fixed by plants to the next tropic level of carnivores. They also maintain the plant population under control.<\/li>\n<li class=\"question-list\">Calotropis produces highly poisonous cardiac glycosides which inhibit make the herbivore sick when eaten, inhibit feeding or digestion and disrupts its reproduction or even kill the herbivore hence it is not browsed by cattle.<\/li>\n<li class=\"question-list\">&#8211; S-shaped pattern represents logistic growth<br \/>\n&#8211; T-shaped pattern represents unlimited growth<br \/>\n&#8211; The population grows in an exponential or geometric fashion and results in a T-shaped curve<\/li>\n<li class=\"question-list\"><strong>Population :<\/strong>\u00a0A population is the collection of inter breeding organisms of a particular species.<br \/>\n<strong>Community :<\/strong>\u00a0In biological terms, a community is a group of interacting organisms (or different species) sharing an environment.<\/li>\n<li class=\"question-list\">&#8211; Commensalism<br \/>\n&#8211; As egrets move, the cattle stir up and flush out from the vegetation the insects which otherwise might be difficult for the egrets to find and catch. Thus, the egrets are benefited while the cattle are neither benefited nor harmed.<\/li>\n<li class=\"question-list\">Phenotype adaptations are acquired non-genetic changes in individuals such as physiological modification, acclimatization or behavioural changes. For example, if a person has ever been to any high altitude, on visiting such as place he or she must have altitude sickness because body does not get enough oxygen. But gradually he or she gets acclimatized and stop experiencing altitude sickness.<\/li>\n<li class=\"question-list\">Heat loss or heat gain is a function of surface area.<br \/>\n&#8211; Since small animals have a large surface area relative to their volume, they lose body heat very fast.<br \/>\n&#8211; But larger animals have a ratio of surface area to volume of the body much smaller compared to small animals and hence thermoregulation in them is more effective.<\/li>\n<li class=\"question-list\"><strong>Effect of temperature or water scarcity and the adaptations of animals: High\u00a0<\/strong>temperature and water scarcity means that an animal living in those condition has to preserve as much water as possible. Most of the animals do this by developing hard scaly skins which prevents water loss. Further most of the animals living in dry conditions use uricotelic mode of excretion. This helps in preventing further water loss. Many exothermic animals from Reptilian thrive in high temperature because they regulate their body temperature by exothermic means.<\/li>\n<\/ol>\n<div class=\"justify-content-center d-flex\">\n<h2>Class 12 Biology Chapter Wise Test Paper<\/h2>\n<ol>\n<li><a href=\"https:\/\/mycbseguide.com\/blog\/important-questions-for-class-12-biology-reproduction-in-organisms\/\">Reproduction in Organisms<\/a><\/li>\n<li><a href=\"https:\/\/mycbseguide.com\/blog\/extra-questions-for-class-12-biology-sexual-reproduction-in-flowering-plants\/\">Sexual Reproduction in Flowering Plants<\/a><\/li>\n<li><a href=\"https:\/\/mycbseguide.com\/blog\/class-12-biology-human-reproduction-extra-qusetions\/\">Human Reproduction<\/a><\/li>\n<li><a href=\"https:\/\/mycbseguide.com\/blog\/extra-questions-for-class-12-biology-reproductive-health\/\">Reproductive Health<\/a><\/li>\n<li><a href=\"https:\/\/mycbseguide.com\/blog\/class-12-biology-principles-of-inheritance-and-variation-extra-questions\/\">Principles of Inheritance and Variation<\/a><\/li>\n<li><a href=\"https:\/\/mycbseguide.com\/blog\/extra-questions-of-class-12-biology-molecular-basis-of-inheritance\/\">Molecular Basis of Inheritance<\/a><\/li>\n<li><a href=\"https:\/\/mycbseguide.com\/blog\/class-12-biology-evolution-chapter-7-important-questions\/\">Evolution<\/a><\/li>\n<li><a href=\"https:\/\/mycbseguide.com\/blog\/practice-questions-of-class-12-biology-human-health-and-disease\/\">Human Health and Disease<\/a><\/li>\n<li><a href=\"https:\/\/mycbseguide.com\/blog\/extra-questions-for-class-12-biology-strategies-for-enhancement-in-food-production\/\">Strategies for Enhancement in Food Production<\/a><\/li>\n<li><a href=\"https:\/\/mycbseguide.com\/blog\/class-12-biology-microbes-in-human-welfare-extra-questions\/\">Microbes in Human Welfare<\/a><\/li>\n<li><a href=\"https:\/\/mycbseguide.com\/blog\/extra-questions-of-class-12-biology-biotechnology-principles-and-processes\/\">Biotechnology Principles and Processes<\/a><\/li>\n<li><a href=\"https:\/\/mycbseguide.com\/blog\/extra-questions-for-class-12-biology-biotechnology-and-its-applications\/\">Biotechnology and its Applications<\/a><\/li>\n<li><a href=\"https:\/\/mycbseguide.com\/blog\/class-12-biology-organisms-and-populations-important-questions\/\">Organisms and Populations<\/a><\/li>\n<li><a href=\"https:\/\/mycbseguide.com\/blog\/class-12-biology-chapter-14-ecosystem-extra-questions\/\">Ecosystem<\/a><\/li>\n<li><a href=\"https:\/\/mycbseguide.com\/blog\/extra-questions-for-class-12-biology-biodiversity-and-conservation\/\">Biodiversity and Conservation<\/a><\/li>\n<li><a href=\"https:\/\/mycbseguide.com\/blog\/important-questions-of-class-12-biology-environmental-issues\/\">Environmental Issues<\/a><\/li>\n<\/ol>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Class 12 Biology Organisms and Populations Important Questions. myCBSEguide has just released Chapter Wise Question Answers for class 12 Biology. There chapter wise Test papers with complete solutions are available for download in myCBSEguide\u00a0website and mobile app. These Extra Questions with solution are prepared by our team of expert teachers who are teaching grade in &#8230; <a title=\"Class 12 Biology Organisms and Populations Important Questions\" class=\"read-more\" href=\"https:\/\/mycbseguide.com\/blog\/class-12-biology-organisms-and-populations-important-questions\/\" aria-label=\"More on Class 12 Biology Organisms and Populations Important Questions\">Read more<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1435,1346],"tags":[151,1839,1838,1833,1832],"class_list":["post-27122","post","type-post","status-publish","format-standard","hentry","category-biology-cbse-class-12","category-cbse","tag-cbse-class-12-biology","tag-extra-questions","tag-important-questions","tag-latest-exam-questions","tag-practice-questions"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Class 12 Biology Organisms and Populations Important Questions<\/title>\n<meta name=\"description\" content=\"Class 12 Biology Organisms and Populations Important Questions chapter wise with complete solutions are available for download in myCBSEguide\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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