In which structure does the digestion of carbohydrates first occur?

Given below are two statements:
$Statement-I$: Chymotrypsin converts proteins as well as proteoses and peptones to polypeptides.
$Statement-II$: Trypsin converts polypeptides to dipeptides.
In the light of above statements, choose the most appropriate answer from the options given below.

The process of digestion in humans is:

Trypsin differs from pepsin in that it digests ...... .

If the secretion of parietal cells of the gastric glands is blocked by an inhibitor,what will happen?

In mammals,the digestion of starch starts from: