{"id":27110,"date":"2019-09-13T15:50:20","date_gmt":"2019-09-13T10:20:20","guid":{"rendered":"http:\/\/mycbseguide.com\/blog\/?p=27110"},"modified":"2019-09-16T10:34:25","modified_gmt":"2019-09-16T05:04:25","slug":"class-12-biology-microbes-in-human-welfare-extra-questions","status":"publish","type":"post","link":"https:\/\/mycbseguide.com\/blog\/class-12-biology-microbes-in-human-welfare-extra-questions\/","title":{"rendered":"Class 12 Biology Microbes in Human Welfare Extra Questions"},"content":{"rendered":"

Class 12 Biology Microbes in Human Welfare Extra Questions. <\/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 10 Practice Test<\/strong><\/p>\n

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

CBSE Class 12 Biology Chapter 10 Test Papers<\/h2>\n
\n

Ch-10 Microbes in Human Welfare<\/strong><\/p>\n

\n<\/div>\n
    \n
  1. Colostrum is rich in\n
      \n
    1. \u200b\u200b\u200b\u200b\u200b\u200bIgA<\/span><\/li>\n
    2. IgZ<\/li>\n
    3. IgF<\/li>\n
    4. IgD<\/li>\n<\/ol>\n<\/li>\n
    5. Semi-conservative replication of DNA was first demonstrated in\n
        \n
      1. \n
        Salmonella typhimurium<\/span><\/div>\n<\/li>\n
      2. \n
        Streptococcus pneumoniae<\/span><\/div>\n<\/li>\n
      3. \n
        Drosophila melanogaster<\/span><\/div>\n<\/li>\n
      4. \n
        Escherichia coli<\/span><\/div>\n<\/li>\n<\/ol>\n<\/li>\n
      5. \n
        The part of the plant used for somatic hybridization is<\/div>\n
          \n
        1. \n
          Genome<\/span><\/div>\n<\/li>\n
        2. \n
          Meristem<\/span><\/div>\n<\/li>\n
        3. \n
          Protoplast<\/span><\/div>\n<\/li>\n
        4. \n
          Nucleus<\/span><\/div>\n<\/li>\n<\/ol>\n<\/li>\n
        5. \n
          Two microbes found to be very useful in genetic engineering are<\/div>\n
            \n
          1. \n
            Vibrio cholerae and a tailed Bacteriophage<\/span><\/div>\n<\/li>\n
          2. \n
            Diplococcus sp. and Pseudomonas sp.<\/span><\/div>\n<\/li>\n
          3. \n
            Escherichia coli and Agrobacterium tumefaciens<\/span><\/div>\n<\/li>\n
          4. \n
            Crown gall bacterium and Caenorhabditis elegans<\/span><\/div>\n<\/li>\n<\/ol>\n<\/li>\n
          5. \n
            Physical removal of large and small particle from the sewage through filtration and sedimentation is called<\/div>\n
              \n
            1. \n
              Primary treatment<\/span><\/div>\n<\/li>\n
            2. \n
              Secondary treatment<\/span><\/div>\n<\/li>\n
            3. \n
              Tertiary treatment<\/span><\/div>\n<\/li>\n
            4. \n
              Quaternary treatment<\/span><\/div>\n<\/li>\n<\/ol>\n<\/li>\n
            5. \n
              Which of the following group of diseases are treated using antibiotics?<\/div>\n
                \n
              1. \n
                Plague, diphtheria, whooping cough<\/span><\/div>\n<\/li>\n
              2. \n
                Diphtheria, leprosy, common cold<\/span><\/div>\n<\/li>\n
              3. \n
                Leprosy, common cold, plague<\/span><\/div>\n<\/li>\n
              4. \n
                Common cold, malaria, plague<\/span><\/div>\n<\/li>\n<\/ol>\n<\/li>\n
              5. In which food would you find lactic acid bacteria? Mention same of their useful applications.<\/li>\n
              6. \n
                \n

                Name some Indian traditional foods made of wheat, rice and Bengal gram (or their products) which involve use of microbes.<\/p>\n<\/div>\n<\/li>\n

              7. \n
                \n
                \n

                Large holes are found in Swiss cheese. (give reason)<\/p>\n<\/div>\n<\/div>\n<\/li>\n

              8. \n
                \n
                \n

                Microbes can be used to decrease the use of chemical fertilizers and pesticides. Explain how this can be accomplished?<\/p>\n<\/div>\n<\/div>\n<\/li>\n

              9. \n
                \n
                \n

                What is the difference in production of wine and whisky?<\/p>\n<\/div>\n<\/div>\n<\/li>\n

              10. \n
                \n
                \n

                Arrange the following in the decreasing order (most important first) of their importance, for the welfare of human society. Give reasons for your answer, Biogas, Citric acid, Penicillin and curd.<\/p>\n<\/div>\n<\/div>\n<\/li>\n

              11. \n
                \n
                \n

                Common yeast is known as Baker’s yeast and also as Brewer’s yeast. Justify.<\/p>\n<\/div>\n<\/div>\n<\/li>\n

              12. \n
                \n
                \n

                BOD of two samples of water A and B were 120 mg\/L and 400 mg\/L respectively. Which sample is more polluted?<\/p>\n<\/div>\n<\/div>\n<\/li>\n

              13. \n
                \n
                \n

                Explain the different steps involved in sewage treatment before it can be released into natural water bodies.<\/p>\n<\/div>\n<\/div>\n<\/li>\n<\/ol>\n

                Ch-10 Microbes in Human Welfare<\/strong><\/p>\n

                \n

                Answer<\/strong><\/p>\n

                  \n
                1. \n
                    \n
                  1. IgA,\u00a0Explanation:\u00a0<\/strong>Colostrum (also known as beestings or first milk) is a form of milk produced by the mammary glands in late pregnancy and the few days after giving birth. Human and bovine colostrums are thick, sticky and yellowish.
                    \nColostrum is known to contain immune cells (as lymphocytes) and many antibodies such as IgA, IgG, and IgM.<\/li>\n<\/ol>\n<\/li>\n
                  2. \n
                      \n
                    1. Escherichia coli,\u00a0Explanation:\u00a0<\/strong>Semi-conservative replication of DNA was first demonstrated in bacterium Escherichia coli as it contain single chromosome within the cell without nuclear membrane.<\/li>\n<\/ol>\n<\/li>\n
                    2. \n
                        \n
                      1. Protoplast,\u00a0Explanation:\u00a0<\/strong>The process by which protoplasts of two different plant species fuse together to form hybrids is known as somatic hybridisation and the hybrids so produced is known as somatic hybrids.
                        \nThe technique of somatic hybridisation involves the following steps.<\/p>\n
                          \n
                        1. Isolation of protoplasts<\/li>\n
                        2. Fusion of different protoplasts:<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<\/li>\n
                        3. \n
                            \n
                          1. Escherichia coli and Agrobacterium tumefaciens,\u00a0Explanation:<\/strong>\u00a0Microbes are used in genetic engineering technology to alter the gene for getting desired traits. E.coli and Agrobacterium tumefaciens are most widely used bacteria for genetic engineering.<\/li>\n<\/ol>\n<\/li>\n
                          2. \n
                              \n
                            1. Primary treatment,\u00a0Explanation:\u00a0<\/strong>Primary treatment of sewage treatment involves physical removal of large and small particles like paper, plastic, pebble by passing through screen.<\/li>\n<\/ol>\n<\/li>\n
                            2. \n
                                \n
                              1. Plague, diphtheria, whooping cough,\u00a0Explanation:\u00a0<\/strong>Antibiotics are strong medicines that treat bacterial infections. Antibiotics won’t treat viral infections because they can’t kill viruses.
                                \nAntibiotics can treat bacterial infections by killing the bacteria that causes them.
                                \nAntibiotics have improved our capacity to treat deadly disease like Plague, diphtheria (gal ghotu), whooping cough (kali khansi), leprosy etc.<\/li>\n<\/ol>\n<\/li>\n
                              2. Lactic acid bacteria are found in curd and yoghurt.
                                \nThis bacteria increases the nutritional quality of curd by increasing the content of Vitamin\u00a0B<\/span>12<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>B12<\/span><\/span><\/span>. In our stomach it plays very beneficial role in checking disease causing microbes.<\/li>\n
                              3. \n