{"id":27136,"date":"2019-09-14T15:33:28","date_gmt":"2019-09-14T10:03:28","guid":{"rendered":"http:\/\/mycbseguide.com\/blog\/?p=27136"},"modified":"2019-09-16T10:38:00","modified_gmt":"2019-09-16T05:08:00","slug":"important-questions-of-class-12-biology-environmental-issues","status":"publish","type":"post","link":"https:\/\/mycbseguide.com\/blog\/important-questions-of-class-12-biology-environmental-issues\/","title":{"rendered":"Important Questions of Class 12 Biology Environmental Issues"},"content":{"rendered":"

Important Questions of Class 12 Biology Environmental Issues. <\/strong>myCBSEguide has just released Chapter Wise Question Answers for class 12 Biology.\u00a0 There chapter wise Test papers with complete solutions are available for download in\u00a0myCBSEguide<\/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\u00a0CBSE Class 12 Biology<\/strong>\u00a0syllabus<\/strong><\/a>\u00a0and questions are framed as per the latest marking scheme and blue print issued by CBSE for Class 12.<\/p>\n

CBSE Class 12 Biology Ch \u2013 16 Practice Test<\/strong><\/p>\n

Download as PDF<\/a><\/strong><\/p>\n

CBSE Class 12 Biology Chapter 16 Test Papers<\/h2>\n
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Ch-16 Environmental Issues<\/strong><\/p>\n

\n<\/div>\n
    \n
  1. Shifting cultivation practiced in India is called\n
      \n
    1. Rabi<\/span><\/li>\n
    2. Jhum<\/li>\n
    3. Sawani<\/li>\n
    4. Harshi<\/li>\n<\/ol>\n<\/li>\n
    5. Air pollution is:\n
        \n
      1. 5th leading cause of deaths in Indian sub-continent.<\/li>\n
      2. ranked among top 10 killers in the world.<\/li>\n
      3. 7th most dangerous killer in south Asia.\n
          \n
        1. \n
          only ii & iii are correct<\/span><\/div>\n<\/li>\n
        2. \n
          all statements are correct<\/span><\/div>\n<\/li>\n
        3. \n
          only i & iii are correct<\/span><\/div>\n<\/li>\n
        4. \n
          only i & ii are correct<\/span><\/div>\n<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<\/li>\n
        5. \n
          Which one of the following is not an ecological pyramid<\/div>\n
            \n
          1. \n
            Pyramid of standing crop<\/span><\/div>\n<\/li>\n
          2. \n
            Pyramid of energy<\/span><\/div>\n<\/li>\n
          3. \n
            Pyramid of biomass<\/span><\/div>\n<\/li>\n
          4. \n
            Pyramid of number<\/span><\/div>\n<\/li>\n<\/ol>\n<\/li>\n
          5. \n
            Primary constituents of photochemical smog are<\/div>\n
              \n
            1. \n
              SO2<\/sub>\u00a0and Water<\/span><\/div>\n<\/li>\n
            2. \n
              N<\/span>O<\/span>2<\/span><\/span><\/span><\/span><\/span><\/span>NO2<\/span><\/span><\/span>\u00a0and PAN<\/span><\/div>\n<\/li>\n
            3. \n
              N<\/span>H<\/span>3<\/span><\/span><\/span><\/span><\/span><\/span>NH3<\/span><\/span><\/span>and DDT<\/span><\/div>\n<\/li>\n<\/ol>\n<\/li>\n
            4. \n
              An amendment in Air (Prevention and control of Pollution) Act1981 included a new pollutant named :<\/div>\n
                \n
              1. \n
                heat<\/span><\/div>\n<\/li>\n
              2. \n
                solid waste<\/span><\/div>\n<\/li>\n
              3. \n
                radioactive waste<\/span><\/div>\n<\/li>\n
              4. \n
                noise<\/span><\/div>\n<\/li>\n<\/ol>\n<\/li>\n
              5. Humans as well as other animals have been dumping their wastes into the environment for thousand of years. What is the reason that this appears to be such a problem today?<\/li>\n
              6. \n
                \n
                \n

                Biological magnification is more likely in aquatic food chains. (True\/False)<\/p>\n<\/div>\n<\/div>\n<\/li>\n

              7. \n
                \n
                \n

                Poison like DDT become more magnified (concentrated) as they pass upward from one trophic level to another. (True\/False)<\/p>\n<\/div>\n<\/div>\n<\/li>\n

              8. \n
                \n
                \n

                The city government is planning to bring metro rail to your area. But this will require around 10,000 trees to be cut. Do you think govt. should go ahead with the project? Justify your answer?<\/p>\n<\/div>\n<\/div>\n<\/li>\n

              9. \n
                \n
                \n

                What is eutrophication? Explain its consequence on the life of plants and animals in such water bodies.<\/p>\n<\/div>\n<\/div>\n<\/li>\n

              10. \n
                \n
                \n

                Study the graph given below and answer the<\/p>\n

                  \n
                1. What is the relationship between dissolved oxygen and biochemical oxygen
                  \n\"Important<\/li>\n
                2. Mention their effect on aquatic life in the river.<\/li>\n<\/ol>\n<\/div>\n<\/div>\n<\/li>\n
                3. \n
                  \n
                  \n

                  You have read the newspaper reports that lots of cows die because of polythene bags getting entangled in their intestine. You go to market and see vegetable vender selling vegetables in plastic bags. What will be your suggestion to –<\/p>\n

                  (i) buyer and (ii) seller?<\/p>\n<\/div>\n<\/div>\n<\/li>\n

                4. \n
                  \n
                  \n

                  Study the given aquatic food chain and answer the question that follows:<\/p>\n

                    \n
                  1. Given reason why there is a continuous increase in the DDT content in different trophic levels of the chain.<\/li>\n
                  2. Name the phenomenon responsible for the increase is DDT content.
                    \n\"Important<\/li>\n<\/ol>\n<\/div>\n<\/div>\n<\/li>\n
                  3. \n
                    \n
                    \n

                    A few months ago the people of Ramgarh started a bad practice of disposing their waste in the pond of village which was earlier source of drinking water. It resulted in deterioration of quality of water and fish mortality.<\/p>\n

                    (a) What changes do you think have taken place in pond? Name such condition.<\/p>\n

                    (b) What measure will you take to stop villagers for such practices as well as to improve the condition?<\/p>\n<\/div>\n<\/div>\n<\/li>\n

                  4. \n
                    \n
                    \n

                    What are the various constituents of domestic sewage? Discuss the effects of sewage discharge on a river.<\/p>\n<\/div>\n<\/div>\n<\/li>\n<\/ol>\n

                    Ch-16 Environmental Issues<\/strong><\/p>\n

                    \n

                    Answer<\/b><\/p>\n

                      \n
                    1. \n
                        \n
                      1. Jhum,\u00a0Explanation:\u00a0<\/strong>Shifting cultivation practiced in India is called jhum cultivation in which forest is cleaned for agriculture practice and after few years this area is abandoned and another forest land is cleared.<\/li>\n<\/ol>\n<\/li>\n
                      2. \n
                          \n
                        1. only i & ii are correct,\u00a0Explanation:\u00a0<\/strong>Air pollution causes a number of respiratory disease including lung cancer. It is the 5th leading causes of deaths in Indian sub-constinent and 7th most dangerous killer in south Asia.<\/li>\n<\/ol>\n<\/li>\n
                        2. \n
                            \n
                          1. Pyramid of standing crop,\u00a0Explanation:\u00a0<\/strong>The ecological pyramids represent the trophic structure and also trophic function of the ecosystem. In many ecological pyramids, the producer form the base and the successive trophic levels make up the apex.\u00a0The ecological pyramids may be of following three kinds.<\/strong>\n