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NEET Biology Digestion and Absorption Question Bank Physiology of Digestion

  • question_answer
    The normal brown-red colour of faeces is due to the presence of:

    A) bilirubin                 

    B) biliverdin

    C) stercobilin              

    D) urobilinogen

    Correct Answer: D

    Solution :

    Stercobilin is the pigment that imparts the characteristic brown-red colour to stools. Bilirubin is reduced to urobilinogen by bacterial flora. Urobilinogen is further reduced to strecobilinogen. Oxidation of stercobilinogen in air yields stercobilin. 


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