UPSC General Studies Sample Paper General Studies Sample Paper-10

  • question_answer
    Consider the following statements regarding 'ecological succession'.                        
    1. A forest fire, windstorm can never be the cause of ecological succession.                       
    2. In ecological succession, the previously dominant species may fail.                             
    3. Succession is directly proportional to the stability to the ecosystem.                           
    Which of the statements given above are correct?                                       

    A)  1 and 3            

    B)  1 and 2            

    C)  2 and 3           

    D)  All of these     

    Correct Answer: C

    Solution :

    [c] 'Ecological succession' is the observed process of change in the species structure of an ecological community over time. As long as the ecosystem's set of environmental conditions remains constant, those species optimally adapted to those conditions will flourish. Under the changed conditions of the environment, the previously dominant species may fail and another species may become ascendant. Ecological succession may also occur when the conditions of an environment suddenly and drastically change. A forest fires, windstorm and human activities like agriculture all greatly alter the conditions of an environment. These massive forces may also destroy species and thus alter the dynamics of the ecological community triggering a scramble for dominance among the species still present.

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