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Question

Biology Question on Digestion and absorption

The pungent odour of faeces is due to ne presence of

A

indole and skatole

B

skatole only

C

phenol and hydrogen sulphide

D

All of the above

Answer

All of the above

Explanation

Solution

The faeces normally contain water, inorganic salts, mucous, undigestible food residues, pigments, dead bacteria and cells and some fat including cholesterol. Its brown colour is due to sterobilin and urobilin, which are derivatives of bilirubin. The odour is caused principally by products of bacterial action. The actual odouriferous products include indole, skatole, mercaptans and hydrogen sulphide.