{"id":27126,"date":"2019-09-14T12:58:45","date_gmt":"2019-09-14T07:28:45","guid":{"rendered":"http:\/\/mycbseguide.com\/blog\/?p=27126"},"modified":"2019-09-16T10:36:50","modified_gmt":"2019-09-16T05:06:50","slug":"class-12-biology-chapter-14-ecosystem-extra-questions","status":"publish","type":"post","link":"https:\/\/mycbseguide.com\/blog\/class-12-biology-chapter-14-ecosystem-extra-questions\/","title":{"rendered":"Class 12 Biology Chapter 14 Ecosystem Extra Questions"},"content":{"rendered":"

Class 12 Biology Chapter 14 Ecosystem 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 \u201314 Practice Test<\/strong><\/p>\n

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

CBSE Class 12 Biology Chapter 14 Test Papers<\/h2>\n
\n

Ch-14 Ecosystem<\/strong><\/p>\n

\n<\/div>\n
    \n
  1. The metabolic process which causes a reduction in gross primary production\n
      \n
    1. digestion<\/span><\/li>\n
    2. excretion<\/li>\n
    3. respiration<\/li>\n
    4. transportation<\/li>\n<\/ol>\n<\/li>\n
    5. Which of the following can be categorised as a photoautotroph?\n
        \n
      1. \n
        Cuscuta<\/span><\/div>\n<\/li>\n
      2. \n
        Euglena<\/span><\/div>\n<\/li>\n
      3. \n
        Hydra<\/span><\/div>\n<\/li>\n
      4. \n
        Rafflesia<\/span><\/div>\n<\/li>\n<\/ol>\n<\/li>\n
      5. \n
        An ecological succession on bare land proceeds towards<\/div>\n
          \n
        1. \n
          Increasing wetness<\/span><\/div>\n<\/li>\n
        2. \n
          Increasing fossils<\/span><\/div>\n<\/li>\n
        3. \n
          Increasing dryness<\/span><\/div>\n<\/li>\n
        4. \n
          Decreasing wetness<\/span><\/div>\n<\/li>\n<\/ol>\n<\/li>\n
        5. \n
          Sparrow is<\/div>\n
            \n
          1. \n
            only\u00a01<\/span>\u2218<\/span><\/span><\/span><\/span>1\u2218<\/span><\/span><\/span>consumer<\/span><\/div>\n<\/li>\n
          2. \n
            only\u00a02<\/span>\u2218<\/span><\/span><\/span><\/span>2\u2218<\/span><\/span><\/span>consumer<\/span><\/div>\n<\/li>\n
          3. \n
            both\u00a01<\/span>\u2218<\/span><\/span><\/span><\/span>1\u2218<\/span><\/span><\/span>\u00a0consumer and\u00a02<\/span>\u2218<\/span><\/span><\/span><\/span>2\u2218<\/span><\/span><\/span>consumer<\/span><\/div>\n<\/li>\n
          4. \n
            3<\/span>\u2218<\/span><\/span><\/span><\/span>3\u2218<\/span><\/span><\/span>consumer<\/span><\/div>\n<\/li>\n<\/ol>\n<\/li>\n
          5. \n
            The individual transitional communities are termed seral stages or<\/div>\n
              \n
            1. \n
              Seral species<\/span><\/div>\n<\/li>\n
            2. \n
              Seral communities<\/span><\/div>\n<\/li>\n
            3. \n
              Seral organisms<\/span><\/div>\n<\/li>\n
            4. \n
              Climax organisms<\/span><\/div>\n<\/li>\n<\/ol>\n<\/li>\n
            5. \n
              \n

              What are decomposes? What is their function in the ecosystem?<\/p>\n<\/div>\n<\/li>\n

            6. \n
              \n
              \n

              No energy that is trapped into an organism remains in it forever. (True\/False)<\/p>\n<\/div>\n<\/div>\n<\/li>\n

            7. \n
              \n
              \n

              Mention the role of pioneer species in primary succession on rocks.<\/p>\n<\/div>\n<\/div>\n<\/li>\n

            8. \n
              \n
              \n

              List the four important changes, taking place during biotic succession.<\/p>\n<\/div>\n<\/div>\n<\/li>\n

            9. \n
              \n
              \n

              The temperate regions show a lower value of primary productivity as compared to tropical regions. Give two reasons.<\/p>\n<\/div>\n<\/div>\n<\/li>\n

            10. \n
              \n
              \n

              Distinguish between: Grazing food chain and detritus food chain.<\/p>\n<\/div>\n<\/div>\n<\/li>\n

            11. \n
              \n
              \n

              Distinguish between: Production and Decomposition<\/p>\n<\/div>\n<\/div>\n<\/li>\n

            12. \n
              \n
              \n

              Describe the components of an ecosystem.<\/p>\n<\/div>\n<\/div>\n<\/li>\n

            13. \n
              \n
              \n

              Describe the process of decomposition of detritus under the following heads Fragmentation, Leaching, Catabolism, Humification and Mineralization.<\/p>\n<\/div>\n<\/div>\n<\/li>\n

            14. \n
              \n
              \n

              What is primary productivity? Give brief description of factors that affect primary productivity.<\/p>\n<\/div>\n<\/div>\n<\/li>\n<\/ol>\n

              Ch-14 Ecosystem<\/strong><\/p>\n

              \n

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

                \n
              1. \n
                  \n
                1. respiration,\u00a0Explanation:\u00a0<\/strong>Net primary production is the rate at which all the plants in an ecosystem produce net useful chemical energy; it is equal to the difference between the rate at which the plants in an ecosystem produce useful chemical energy (GPP) and the rate at which they use some of that energy during respiration.
                  \nSo respiration is the metabolic process which causes a reduction in gross primary production.<\/li>\n<\/ol>\n<\/li>\n
                2. \n
                    \n
                  1. Euglena,\u00a0Explanation:\u00a0<\/strong>Photoautotrophs are organism that perform photosynthesis in presence of sunlight. Euglena contains chlorophyll and fixes the solar energy so, it acts as photoautotrophs.<\/li>\n<\/ol>\n<\/li>\n
                  2. \n
                      \n
                    1. Increasing wetness,\u00a0Explanation:\u00a0<\/strong>An ecological succession on bare land proceeds towards increasing wetness. Availability of water help in faster growth of organism including plants.<\/li>\n<\/ol>\n<\/li>\n
                    2. \n
                        \n
                      1. both\u00a01<\/span>\u2218<\/span><\/span><\/span><\/span>1\u2218<\/span><\/span><\/span>\u00a0consumer and\u00a02<\/span>\u2218<\/span><\/span><\/span><\/span>2\u2218<\/span><\/span><\/span>consumer,\u00a0Explanation:\u00a0<\/strong>Sparrow feeds on fruits as well insects. Herbivores or plant eaters are primary consumer and carnivores that feed on herbivores are secondary consumer. So, Sparrow occupy both primary and secondary trophic levels.<\/li>\n<\/ol>\n<\/li>\n
                      2. \n
                          \n
                        1. Seral communities,\u00a0Explanation:\u00a0<\/strong>A seral community or seral stage is an intermediate stage found in ecological succession in an ecosystem advancing towards its climax community. In many cases more than one seral stage evolves until climax conditions are attained.
                          \nA prisere is a collection of seres making up the development of an area from non-vegetated surfaces to a climax community.<\/li>\n<\/ol>\n<\/li>\n
                        2. Decomposers are saprophagous \/ saprotrophs, which feed on dead bodies of organisms and organic wastes of living organisms.
                          \n– They bring about decomposition and mineralisation of the dead matter to release them back for reuse by the autotrophs.<\/li>\n
                        3. True<\/li>\n
                        4. In primary succession on rocks, the pioneer species invade a bare area and give way for other species to grow.<\/li>\n
                        5. \n
                            \n
                          1. Small short lived plants (r-selection) to large long-lived plants (k-selection)<\/li>\n
                          2. Unstable biotic community to stable biotic community.<\/li>\n
                          3. Little diversity to a high degree of diversity.<\/li>\n
                          4. Aquatic or dry conditions to mesic conditions.<\/li>\n<\/ol>\n<\/li>\n
                          5. \n
                              \n
                            1. It is severely limited by a cold climate.<\/li>\n
                            2. Temperate regions have short snow-free growing period in a year<\/li>\n<\/ol>\n<\/li>\n
                            3. \n