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NEET Biology Breathing and Exchange of gases (Animal Respiration) Question Bank Self Evaluation Test - Breathing and Exchange of Gases

  • question_answer
    The graph shows four dissociation curves.
        
    Which curve represents the oxygen dissociation curve for myoglobin?

    A)  I                  

    B)                    II

    C) III                                            

    D) IV

    Correct Answer: A

    Solution :

    [a] Myoglobin has only one haem group and there can be non-co-operative binding, hence the shape of the dissociation curve is hyperbolic rather than sigmoidal. Also, myoglobin has a very high affinity for oxygen and does not release oxygen until a very low oxygen tension.


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