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  3. 11th Class
  4. Biology

11th Class Biology Sample Paper Biology Sample Paper-1

  • question_answer
    Which of the following labelled parts in the given figure is/are involved in the pH and ionic balance of the body fluids?

    A)  P and  

    B)  P, Q and S

    C)  Q only 

    D)  P, R and S

    Correct Answer: D

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