UPSC General Studies Sample Paper General Studies Sample Paper-2

  • question_answer
    Consider the following statements.
    1. The carrying capacity of an ecosystem remains constant with time and the external environment has very less impact upon it.
    2. The population density in an ecosystem is maximum at the verse of limiting factor.
    3. Optimum population density is the condition, where individuals in the population will have an adequate supply of all essentials for existence.
    Which of the statement(s) given above is/are correct?

    A)  Only 3             

    B)  1 and 2            

    C)  2 and 3           

    D)  All of these

    Correct Answer: C

    Solution :

    [c] The carrying capacity of an ecosystem will not remain constant with time and the external environment has decided impact upon it. The ecosystem is a core concept in Biology and Ecology, serving as the level of biological organisation in which organisms interact simultaneously with each other and with their environment. As such, ecosystems are a level above that of the ecological community (organisms of different species interacting with each other) but are at a level below or equal to, biomes and the biosphere. Essentially, biomes are regional ecosystems and the biosphere is the largest of all possible ecosystems. Carrying capacity is the maximum population of any species that can survive in a particular area before the ecosystem becomes too degraded. Population is affected by factors such as disease, competition and predator-prey relationships. Ecosystems are dynamic entities -invariably, they are subject to periodic disturbances and are in the process of recovering from some past disturbance. When an ecosystem is subject to some sort of perturbation, it responds by moving away from its initial state. The tendency of a system to remain close to its equilibrium state, despite that disturbance, is termed as its resistance. On the other hand, the speed with which it returns to its initial state after disturbance is called its resilience.

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