SSC Ecology And Environment Sample Paper NCERT Sample Paper-4

  • question_answer
    The energy flow in an ecosystem is:
    1. Unidirectional
    2. Non-cyclic
    3. Cyclic
    4. Bidirectional
    Select the correct answer using the codes given below.

    A)  1 and 2 only     

    B)  1 and 3 only

    C)  2 and 4 only     

    D)  3 and 4 only

    Correct Answer: A

    Solution :

    [a] It is to be noted that energy flow in an ecosystem is unidirectional and non-cyclic, whereas nutrient flow is cyclic. The energy enters the plants (from the sun) through photosynthesis during the making of food. This energy is then passed on from one organism to another in a food chain. Energy given out by the organisms as heat is lost to the environment, it does not return to be used by the plants again. This makes the flow of energy in ecosystem 'unidirectional'.

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