UPSC General Studies Sample Paper General Studies Sample Paper-4

  • question_answer
    Consider the following statements about the functioning of ecosystem.                      
    1. Complex foodwebs are more frequent in the ecosystem than simpler food chains.                
    2. Iron and zinc are essential nutrients in the food chain.                                           
    3. There is uni-directional flow of energy in an ecosystem.                                        
    4. Nutrients in an. ecosystem move in a cyclic manner.                                           
    Which of the statements given above are correct?                                         

    A)  1 and 2           

    B)  1, 2 and 3            

    C)                      1, 3 and 4                    

    D) (d) 3 and 4                                  

    Correct Answer: C

    Solution :

    [c] Simpler food chains are rarely found in an ecosystem and as ecosystem is an open system food chains are interlinked and forms complex food webs. Iron and zinc are micro nutrients in the food chain whereas major essential nutrients are carbon, nitrogen, phosphorus, potassium, hydrogen, oxygen and sulphur. Energy flow is always uni-directional and cycling of nutrients always take place between the biotic and abiotic component.

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