4th Class Science Animals Question Bank Animals

  • question_answer 20) The graph below show the relationship between two organisms.
    (a) What is the relationship between the two organisms P and Q?
    (b) During which period do you think organism M was introduced?
    (c) What new food chain forms between organisms P, Q and M?
     

    A)

      (a) (b) (c)
      Prey- Predator X \[P\to Q\to M\]
                   

    B)       

      (a) (b) (c)
      Producer-Consumer Y \[M\to Q\to P\]
                   

    C)       

      (a) (b) (c)
      Producer-Consumer Z \[Q\to P\to M\]
                   

    D)       

      (a) (b) (c)
      Prey - Predator z \[Q\to M\to P\]
             

    Correct Answer: D

    Solution :

    (a) 'P' is prey and 'Q' is predator because population of 'P' increases with increase in population of 'Q'.
    (b) When graph 1 and graph 2 are compared, graph 2 shows changes during period 'Z', therefore, organism 'M' was introduced during this period.
    (c) Graph 2 shows that on introduction of 'M', population of 'P' increases and population of 'Q' goes down, thus, 'Q' is eaten by 'M' and 'M' is eaten by 'P'.
     

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