Answer:
In human beings, food
is ingested through the mouth, where the digestion of food begins.
The mouth plays
following roles in digestion of food
(a) The
teeth cut the food into small pieces, chew and grind it, i.e., help in physical
digestion.
(b) The
salivary glands in mouth secretes saliva which contain an enzyme called salivary
amylase. This enzyme digest the starch present in food into sugar, i.e., help
in chemical digestion.
(c) Tongue
helps in thorough mixing of food with saliva.
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