question_answer

Yellow colour faeces is due to

A)                 stereobilin

B)                 degradation product of haemoglobin

C)                 skatale

D)                 indole

Correct Answer: B

Solution :

Faecal matter of an adult human normally contains 65-75% water, 25-35% solids (inorganic salt, mucus, undigestible food, residue-pigments, dead bacteria and cells). Brown colour is due to urobillin and stereobilin formed by bacterial action over bilirubin. (i) Yellow colour is due to degradation product of haemoglobin. (ii) Odour in faeces is due to skatole, indole mercaptans, \[{{H}_{2}}S\] and \[C{{H}_{4}}\].