UPSC General Studies Sample Paper General Studies Sample Paper-1

  • question_answer
    Which of the following statement(s) is/are correct?
    1. The Net primary productivity in an ecosystem is calculated by reducing the respiratory loss from the gross primary productivity.
    2. Eutrophication is the process of excessive depletion of nutrients in an aquatic ecosystem.
    3. About 90% energy is transferred from the lower tropic level to the higher tropic level.
    4. Primary and secondary succession in an ecosystem are always a natural process.
    Select the correct answer using the codes given below.

    A)  1, 2 and 4                    

    B)  1, 3 and 4         

    C)  Only 1             

    D)  Only 4

    Correct Answer: C

    Solution :

    [c] Gross primary productivity is the total amount of production of chemical energy in organic compounds by primary producers i.e. autotrophs. Certain portion of this biomass is used by the producer for its own survival and only 10% energy is transferred to the next trophic level. Eutrophication is the process of excessive nutrition load in an aquatic ecosystem. Primary succession is one of two types of biological and ecological succession of plant life, occurring in an environment in which new substrate devoid of vegetation and usually lacking soil

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