The process of digestion of food is humans begins in:
(a) stomach    (b) food pipe    (c) mouth    (d) small intestine

Correct Answer: (c) Mouth

Explanation: Digestion begins when food enters the mouth (oral cavity). Teeth grind and break up food. This is called physical or mechanical digestion. Saliva contains salivary amylase which mixes with food. This is called chemical digestion. Thus, mechanical and chemical digestion begins in the mouth.