Question

in human digestion starts in mouth which component of food breaks down in mouth what is the reason behind it​

Answer 1

Yes, in humans digestion starts in mouth. In mouth firstly , complex molecule (starch) is broken down into simple molecule (sugar ) .

This is due to action of enzyme salivary amylase present in saliva.

This enzyme breaks starch into sugar.

Answer 2

the food containing carbohydrates

this is because saliva stores an enzyme called salivary amylase that breaks complex carbohydrates into starch and maltose