4th Class Science Animals Question Bank Animals

  • question_answer
    Refer to the given food chain operating in a small pond.
     
    An organism 'X' was introduced in the community which exclusively feeds on tadpole population. Which of the following graphs correctly shows the changes in populations of water insect and small fish over time after introduction of organism X?
       

    A)                                    

    B)

    C)                                      

    D)

    Correct Answer: C

    Solution :

    In the given food chain, tadpole feeds on water insect and in turn is eaten by small fish. If population of tadpole will decline with time then small fish population will also decrease as former is the food of later. On the other hand, water insect population will be positively affected because in the absence of predator prey population reproduces and flourishes.

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